/[pcre]/code/trunk/doc/pcretest.1
ViewVC logotype

Diff of /code/trunk/doc/pcretest.1

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC revision 518 by ph10, Tue May 18 15:47:01 2010 UTC
# Line 4  pcretest - a program for testing Perl-co Line 4  pcretest - a program for testing Perl-co
4  .SH SYNOPSIS  .SH SYNOPSIS
5  .rs  .rs
6  .sp  .sp
7  .B pcretest "[-C] [-d] [-dfa] [-i] [-m] [-o osize] [-p] [-t] [source]"  .B pcretest "[options] [source] [destination]"
8  .ti +5n  .sp
 .B "[destination]"  
 .P  
9  \fBpcretest\fP was written as a test program for the PCRE regular expression  \fBpcretest\fP was written as a test program for the PCRE regular expression
10  library itself, but it can also be used for experimenting with regular  library itself, but it can also be used for experimenting with regular
11  expressions. This document describes the features of the test program; for  expressions. This document describes the features of the test program; for
# Line 26  documentation. Line 24  documentation.
24  .SH OPTIONS  .SH OPTIONS
25  .rs  .rs
26  .TP 10  .TP 10
27    \fB-b\fP
28    Behave as if each regex has the \fB/B\fP (show bytecode) modifier; the internal
29    form is output after compilation.
30    .TP 10
31  \fB-C\fP  \fB-C\fP
32  Output the version number of the PCRE library, and all available information  Output the version number of the PCRE library, and all available information
33  about the optional features that are included, and then exit.  about the optional features that are included, and then exit.
34  .TP 10  .TP 10
35  \fB-d\fP  \fB-d\fP
36  Behave as if each regex has the \fB/D\fP (debug) modifier; the internal  Behave as if each regex has the \fB/D\fP (debug) modifier; the internal
37  form is output after compilation.  form and information about the compiled pattern is output after compilation;
38    \fB-d\fP is equivalent to \fB-b -i\fP.
39  .TP 10  .TP 10
40  \fB-dfa\fP  \fB-dfa\fP
41  Behave as if each data line contains the \eD escape sequence; this causes the  Behave as if each data line contains the \eD escape sequence; this causes the
42  alternative matching function, \fBpcre_dfa_exec()\fP, to be used instead of the  alternative matching function, \fBpcre_dfa_exec()\fP, to be used instead of the
43  standard \fBpcre_exec()\fP function (more detail is given below).  standard \fBpcre_exec()\fP function (more detail is given below).
44  .TP 10  .TP 10
45    \fB-help\fP
46    Output a brief summary these options and then exit.
47    .TP 10
48  \fB-i\fP  \fB-i\fP
49  Behave as if each regex has the \fB/I\fP modifier; information about the  Behave as if each regex has the \fB/I\fP modifier; information about the
50  compiled pattern is given after compilation.  compiled pattern is given after compilation.
51  .TP 10  .TP 10
52    \fB-M\fP
53    Behave as if each data line contains the \eM escape sequence; this causes
54    PCRE to discover the minimum MATCH_LIMIT and MATCH_LIMIT_RECURSION settings by
55    calling \fBpcre_exec()\fP repeatedly with different limits.
56    .TP 10
57  \fB-m\fP  \fB-m\fP
58  Output the size of each compiled pattern after it has been compiled. This is  Output the size of each compiled pattern after it has been compiled. This is
59  equivalent to adding \fB/M\fP to each regular expression. For compatibility  equivalent to adding \fB/M\fP to each regular expression. For compatibility
# Line 50  with earlier versions of pcretest, \fB-s Line 61  with earlier versions of pcretest, \fB-s
61  .TP 10  .TP 10
62  \fB-o\fP \fIosize\fP  \fB-o\fP \fIosize\fP
63  Set the number of elements in the output vector that is used when calling  Set the number of elements in the output vector that is used when calling
64  \fBpcre_exec()\fP to be \fIosize\fP. The default value is 45, which is enough  \fBpcre_exec()\fP or \fBpcre_dfa_exec()\fP to be \fIosize\fP. The default value
65  for 14 capturing subexpressions. The vector size can be changed for individual  is 45, which is enough for 14 capturing subexpressions for \fBpcre_exec()\fP or
66  matching calls by including \eO in the data line (see below).  22 different matches for \fBpcre_dfa_exec()\fP. The vector size can be
67    changed for individual matching calls by including \eO in the data line (see
68    below).
69  .TP 10  .TP 10
70  \fB-p\fP  \fB-p\fP
71  Behave as if each regex has the \fB/P\fP modifier; the POSIX wrapper API is  Behave as if each regex has the \fB/P\fP modifier; the POSIX wrapper API is
72  used to call PCRE. None of the other options has any effect when \fB-p\fP is  used to call PCRE. None of the other options has any effect when \fB-p\fP is
73  set.  set.
74  .TP 10  .TP 10
75  \fP-q\fP  \fB-q\fP
76  Do not output the version number of \fBpcretest\fP at the start of execution.  Do not output the version number of \fBpcretest\fP at the start of execution.
77  .TP 10  .TP 10
78    \fB-S\fP \fIsize\fP
79    On Unix-like systems, set the size of the runtime stack to \fIsize\fP
80    megabytes.
81    .TP 10
82  \fB-t\fP  \fB-t\fP
83  Run each compile, study, and match many times with a timer, and output  Run each compile, study, and match many times with a timer, and output
84  resulting time per compile or match (in milliseconds). Do not set \fB-m\fP with  resulting time per compile or match (in milliseconds). Do not set \fB-m\fP with
85  \fB-t\fP, because you will then get the size output a zillion times, and the  \fB-t\fP, because you will then get the size output a zillion times, and the
86  timing will be distorted.  timing will be distorted. You can control the number of iterations that are
87    used for timing by following \fB-t\fP with a number (as a separate item on the
88    command line). For example, "-t 1000" would iterate 1000 times. The default is
89    to iterate 500000 times.
90    .TP 10
91    \fB-tm\fP
92    This is like \fB-t\fP except that it times only the matching phase, not the
93    compile or study phases.
94  .  .
95  .  .
96  .SH DESCRIPTION  .SH DESCRIPTION
# Line 78  that file and writes to stdout. Otherwis Line 102  that file and writes to stdout. Otherwis
102  stdout, and prompts for each line of input, using "re>" to prompt for regular  stdout, and prompts for each line of input, using "re>" to prompt for regular
103  expressions, and "data>" to prompt for data lines.  expressions, and "data>" to prompt for data lines.
104  .P  .P
105    When \fBpcretest\fP is built, a configuration option can specify that it should
106    be linked with the \fBlibreadline\fP library. When this is done, if the input
107    is from a terminal, it is read using the \fBreadline()\fP function. This
108    provides line-editing and history facilities. The output from the \fB-help\fP
109    option states whether or not \fBreadline()\fP will be used.
110    .P
111  The program handles any number of sets of input on a single input file. Each  The program handles any number of sets of input on a single input file. Each
112  set starts with a regular expression, and continues with any number of data  set starts with a regular expression, and continues with any number of data
113  lines to be matched against the pattern.  lines to be matched against the pattern.
114  .P  .P
115  Each data line is matched separately and independently. If you want to do  Each data line is matched separately and independently. If you want to do
116  multiple-line matches, you have to use the \en escape sequence in a single line  multi-line matches, you have to use the \en escape sequence (or \er or \er\en,
117  of input to encode the newline characters. The maximum length of data line is  etc., depending on the newline setting) in a single line of input to encode the
118  30,000 characters.  newline sequences. There is no limit on the length of data lines; the input
119    buffer is automatically extended if it is too small.
120  .P  .P
121  An empty line signals the end of the data lines, at which point a new regular  An empty line signals the end of the data lines, at which point a new regular
122  expression is read. The regular expressions are given enclosed in any  expression is read. The regular expressions are given enclosed in any
123  non-alphanumeric delimiters other than backslash, for example  non-alphanumeric delimiters other than backslash, for example:
124  .sp  .sp
125    /(a|bc)x+yz/    /(a|bc)x+yz/
126  .sp  .sp
# Line 134  effect as they do in Perl. For example: Line 165  effect as they do in Perl. For example:
165  .sp  .sp
166    /caseless/i    /caseless/i
167  .sp  .sp
168  The following table shows additional modifiers for setting PCRE options that do  The following table shows additional modifiers for setting PCRE compile-time
169  not correspond to anything in Perl:  options that do not correspond to anything in Perl:
170  .sp  .sp
171    \fB/A\fP    PCRE_ANCHORED    \fB/8\fP              PCRE_UTF8
172    \fB/C\fP    PCRE_AUTO_CALLOUT    \fB/?\fP              PCRE_NO_UTF8_CHECK
173    \fB/E\fP    PCRE_DOLLAR_ENDONLY    \fB/A\fP              PCRE_ANCHORED
174    \fB/f\fP    PCRE_FIRSTLINE    \fB/C\fP              PCRE_AUTO_CALLOUT
175    \fB/N\fP    PCRE_NO_AUTO_CAPTURE    \fB/E\fP              PCRE_DOLLAR_ENDONLY
176    \fB/U\fP    PCRE_UNGREEDY    \fB/f\fP              PCRE_FIRSTLINE
177    \fB/X\fP    PCRE_EXTRA    \fB/J\fP              PCRE_DUPNAMES
178      \fB/N\fP              PCRE_NO_AUTO_CAPTURE
179      \fB/U\fP              PCRE_UNGREEDY
180      \fB/W\fP              PCRE_UCP
181      \fB/X\fP              PCRE_EXTRA
182      \fB/<JS>\fP           PCRE_JAVASCRIPT_COMPAT
183      \fB/<cr>\fP           PCRE_NEWLINE_CR
184      \fB/<lf>\fP           PCRE_NEWLINE_LF
185      \fB/<crlf>\fP         PCRE_NEWLINE_CRLF
186      \fB/<anycrlf>\fP      PCRE_NEWLINE_ANYCRLF
187      \fB/<any>\fP          PCRE_NEWLINE_ANY
188      \fB/<bsr_anycrlf>\fP  PCRE_BSR_ANYCRLF
189      \fB/<bsr_unicode>\fP  PCRE_BSR_UNICODE
190    .sp
191    The modifiers that are enclosed in angle brackets are literal strings as shown,
192    including the angle brackets, but the letters can be in either case. This
193    example sets multiline matching with CRLF as the line ending sequence:
194    .sp
195      /^abc/m<crlf>
196    .sp
197    As well as turning on the PCRE_UTF8 option, the \fB/8\fP modifier also causes
198    any non-printing characters in output strings to be printed using the
199    \ex{hh...} notation if they are valid UTF-8 sequences. Full details of the PCRE
200    options are given in the
201    .\" HREF
202    \fBpcreapi\fP
203    .\"
204    documentation.
205    .
206    .
207    .SS "Finding all matches in a string"
208    .rs
209  .sp  .sp
210  Searching for all possible matches within each subject string can be requested  Searching for all possible matches within each subject string can be requested
211  by the \fB/g\fP or \fB/G\fP modifier. After finding a match, PCRE is called  by the \fB/g\fP or \fB/G\fP modifier. After finding a match, PCRE is called
# Line 155  substring. This makes a difference to th Line 217  substring. This makes a difference to th
217  begins with a lookbehind assertion (including \eb or \eB).  begins with a lookbehind assertion (including \eb or \eB).
218  .P  .P
219  If any call to \fBpcre_exec()\fP in a \fB/g\fP or \fB/G\fP sequence matches an  If any call to \fBpcre_exec()\fP in a \fB/g\fP or \fB/G\fP sequence matches an
220  empty string, the next call is done with the PCRE_NOTEMPTY and PCRE_ANCHORED  empty string, the next call is done with the PCRE_NOTEMPTY_ATSTART and
221  flags set in order to search for another, non-empty, match at the same point.  PCRE_ANCHORED flags set in order to search for another, non-empty, match at the
222  If this second match fails, the start offset is advanced by one, and the normal  same point. If this second match fails, the start offset is advanced by one
223  match is retried. This imitates the way Perl handles such cases when using the  character, and the normal match is retried. This imitates the way Perl handles
224  \fB/g\fP modifier or the \fBsplit()\fP function.  such cases when using the \fB/g\fP modifier or the \fBsplit()\fP function.
225  .P  .
226    .
227    .SS "Other modifiers"
228    .rs
229    .sp
230  There are yet more modifiers for controlling the way \fBpcretest\fP  There are yet more modifiers for controlling the way \fBpcretest\fP
231  operates.  operates.
232  .P  .P
# Line 169  matched the entire pattern, pcretest sho Line 235  matched the entire pattern, pcretest sho
235  the subject string. This is useful for tests where the subject contains  the subject string. This is useful for tests where the subject contains
236  multiple copies of the same substring.  multiple copies of the same substring.
237  .P  .P
238    The \fB/B\fP modifier is a debugging feature. It requests that \fBpcretest\fP
239    output a representation of the compiled byte code after compilation. Normally
240    this information contains length and offset values; however, if \fB/Z\fP is
241    also present, this data is replaced by spaces. This is a special feature for
242    use in the automatic test scripts; it ensures that the same output is generated
243    for different internal link sizes.
244    .P
245    The \fB/D\fP modifier is a PCRE debugging feature, and is equivalent to
246    \fB/BI\fP, that is, both the \fB/B\fP and the \fB/I\fP modifiers.
247    .P
248    The \fB/F\fP modifier causes \fBpcretest\fP to flip the byte order of the
249    fields in the compiled pattern that contain 2-byte and 4-byte numbers. This
250    facility is for testing the feature in PCRE that allows it to execute patterns
251    that were compiled on a host with a different endianness. This feature is not
252    available when the POSIX interface to PCRE is being used, that is, when the
253    \fB/P\fP pattern modifier is specified. See also the section about saving and
254    reloading compiled patterns below.
255    .P
256    The \fB/I\fP modifier requests that \fBpcretest\fP output information about the
257    compiled pattern (whether it is anchored, has a fixed first character, and
258    so on). It does this by calling \fBpcre_fullinfo()\fP after compiling a
259    pattern. If the pattern is studied, the results of that are also output.
260    .P
261    The \fB/K\fP modifier requests \fBpcretest\fP to show names from backtracking
262    control verbs that are returned from calls to \fBpcre_exec()\fP. It causes
263    \fBpcretest\fP to create a \fBpcre_extra\fP block if one has not already been
264    created by a call to \fBpcre_study()\fP, and to set the PCRE_EXTRA_MARK flag
265    and the \fBmark\fP field within it, every time that \fBpcre_exec()\fP is
266    called. If the variable that the \fBmark\fP field points to is non-NULL for a
267    match, non-match, or partial match, \fBpcretest\fP prints the string to which
268    it points. For a match, this is shown on a line by itself, tagged with "MK:".
269    For a non-match it is added to the message.
270    .P
271  The \fB/L\fP modifier must be followed directly by the name of a locale, for  The \fB/L\fP modifier must be followed directly by the name of a locale, for
272  example,  example,
273  .sp  .sp
# Line 180  locale, and this is then passed to \fBpc Line 279  locale, and this is then passed to \fBpc
279  regular expression. Without an \fB/L\fP modifier, NULL is passed as the tables  regular expression. Without an \fB/L\fP modifier, NULL is passed as the tables
280  pointer; that is, \fB/L\fP applies only to the expression on which it appears.  pointer; that is, \fB/L\fP applies only to the expression on which it appears.
281  .P  .P
282  The \fB/I\fP modifier requests that \fBpcretest\fP output information about the  The \fB/M\fP modifier causes the size of memory block used to hold the compiled
283  compiled pattern (whether it is anchored, has a fixed first character, and  pattern to be output.
 so on). It does this by calling \fBpcre_fullinfo()\fP after compiling a  
 pattern. If the pattern is studied, the results of that are also output.  
 .P  
 The \fB/D\fP modifier is a PCRE debugging feature, which also assumes \fB/I\fP.  
 It causes the internal form of compiled regular expressions to be output after  
 compilation. If the pattern was studied, the information returned is also  
 output.  
 .P  
 The \fB/F\fP modifier causes \fBpcretest\fP to flip the byte order of the  
 fields in the compiled pattern that contain 2-byte and 4-byte numbers. This  
 facility is for testing the feature in PCRE that allows it to execute patterns  
 that were compiled on a host with a different endianness. This feature is not  
 available when the POSIX interface to PCRE is being used, that is, when the  
 \fB/P\fP pattern modifier is specified. See also the section about saving and  
 reloading compiled patterns below.  
284  .P  .P
285  The \fB/S\fP modifier causes \fBpcre_study()\fP to be called after the  The \fB/S\fP modifier causes \fBpcre_study()\fP to be called after the
286  expression has been compiled, and the results used when the expression is  expression has been compiled, and the results used when the expression is
287  matched.  matched.
288  .P  .
289  The \fB/M\fP modifier causes the size of memory block used to hold the compiled  .
290  pattern to be output.  .SS "Using the POSIX wrapper API"
291  .P  .rs
292    .sp
293  The \fB/P\fP modifier causes \fBpcretest\fP to call PCRE via the POSIX wrapper  The \fB/P\fP modifier causes \fBpcretest\fP to call PCRE via the POSIX wrapper
294  API rather than its native API. When this is done, all other modifiers except  API rather than its native API. When \fB/P\fP is set, the following modifiers
295  \fB/i\fP, \fB/m\fP, and \fB/+\fP are ignored. REG_ICASE is set if \fB/i\fP is  set options for the \fBregcomp()\fP function:
296  present, and REG_NEWLINE is set if \fB/m\fP is present. The wrapper functions  .sp
297  force PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is set.    /i    REG_ICASE
298  .P    /m    REG_NEWLINE
299  The \fB/8\fP modifier causes \fBpcretest\fP to call PCRE with the PCRE_UTF8    /N    REG_NOSUB
300  option set. This turns on support for UTF-8 character handling in PCRE,    /s    REG_DOTALL     )
301  provided that it was compiled with this support enabled. This modifier also    /U    REG_UNGREEDY   ) These options are not part of
302  causes any non-printing characters in output strings to be printed using the    /W    REG_UCP        )   the POSIX standard
303  \ex{hh...} notation if they are valid UTF-8 sequences.    /8    REG_UTF8       )
304  .P  .sp
305  If the \fB/?\fP modifier is used with \fB/8\fP, it causes \fBpcretest\fP to  The \fB/+\fP modifier works as described above. All other modifiers are
306  call \fBpcre_compile()\fP with the PCRE_NO_UTF8_CHECK option, to suppress the  ignored.
 checking of the string for UTF-8 validity.  
307  .  .
308  .  .
309  .SH "DATA LINES"  .SH "DATA LINES"
# Line 232  complicated features of PCRE. If you are Line 316  complicated features of PCRE. If you are
316  expressions, you probably don't need any of these. The following escapes are  expressions, you probably don't need any of these. The following escapes are
317  recognized:  recognized:
318  .sp  .sp
319    \ea         alarm (= BEL)    \ea         alarm (BEL, \ex07)
320    \eb         backspace    \eb         backspace (\ex08)
321    \ee         escape    \ee         escape (\ex27)
322    \ef         formfeed    \ef         formfeed (\ex0c)
323    \en         newline    \en         newline (\ex0a)
324    \er         carriage return  .\" JOIN
325    \et         tab    \eqdd       set the PCRE_MATCH_LIMIT limit to dd
326    \ev         vertical tab                 (any number of digits)
327      \er         carriage return (\ex0d)
328      \et         tab (\ex09)
329      \ev         vertical tab (\ex0b)
330    \ennn       octal character (up to 3 octal digits)    \ennn       octal character (up to 3 octal digits)
331    \exhh       hexadecimal character (up to 2 hex digits)    \exhh       hexadecimal character (up to 2 hex digits)
332  .\" JOIN  .\" JOIN
333    \ex{hh...}  hexadecimal character, any number of digits    \ex{hh...}  hexadecimal character, any number of digits
334                 in UTF-8 mode                 in UTF-8 mode
335    .\" JOIN
336    \eA         pass the PCRE_ANCHORED option to \fBpcre_exec()\fP    \eA         pass the PCRE_ANCHORED option to \fBpcre_exec()\fP
337                   or \fBpcre_dfa_exec()\fP
338    .\" JOIN
339    \eB         pass the PCRE_NOTBOL option to \fBpcre_exec()\fP    \eB         pass the PCRE_NOTBOL option to \fBpcre_exec()\fP
340                   or \fBpcre_dfa_exec()\fP
341  .\" JOIN  .\" JOIN
342    \eCdd       call pcre_copy_substring() for substring dd    \eCdd       call pcre_copy_substring() for substring dd
343                 after a successful match (number less than 32)                 after a successful match (number less than 32)
# Line 279  recognized: Line 370  recognized:
370  .\" JOIN  .\" JOIN
371    \eL         call pcre_get_substringlist() after a    \eL         call pcre_get_substringlist() after a
372                 successful match                 successful match
373    .\" JOIN
374    \eM         discover the minimum MATCH_LIMIT and    \eM         discover the minimum MATCH_LIMIT and
375                 MATCH_LIMIT_RECURSION settings                 MATCH_LIMIT_RECURSION settings
376    .\" JOIN
377    \eN         pass the PCRE_NOTEMPTY option to \fBpcre_exec()\fP    \eN         pass the PCRE_NOTEMPTY option to \fBpcre_exec()\fP
378                   or \fBpcre_dfa_exec()\fP; if used twice, pass the
379                   PCRE_NOTEMPTY_ATSTART option
380  .\" JOIN  .\" JOIN
381    \eOdd       set the size of the output vector passed to    \eOdd       set the size of the output vector passed to
382                 \fBpcre_exec()\fP to dd (any number of digits)                 \fBpcre_exec()\fP to dd (any number of digits)
383  .\" JOIN  .\" JOIN
384    \eP         pass the PCRE_PARTIAL option to \fBpcre_exec()\fP    \eP         pass the PCRE_PARTIAL_SOFT option to \fBpcre_exec()\fP
385                 or \fBpcre_dfa_exec()\fP                 or \fBpcre_dfa_exec()\fP; if used twice, pass the
386                   PCRE_PARTIAL_HARD option
387    .\" JOIN
388      \eQdd       set the PCRE_MATCH_LIMIT_RECURSION limit to dd
389                   (any number of digits)
390    \eR         pass the PCRE_DFA_RESTART option to \fBpcre_dfa_exec()\fP    \eR         pass the PCRE_DFA_RESTART option to \fBpcre_dfa_exec()\fP
391    \eS         output details of memory get/free calls during matching    \eS         output details of memory get/free calls during matching
392    .\" JOIN
393      \eY         pass the PCRE_NO_START_OPTIMIZE option to \fBpcre_exec()\fP
394                   or \fBpcre_dfa_exec()\fP
395    .\" JOIN
396    \eZ         pass the PCRE_NOTEOL option to \fBpcre_exec()\fP    \eZ         pass the PCRE_NOTEOL option to \fBpcre_exec()\fP
397                   or \fBpcre_dfa_exec()\fP
398  .\" JOIN  .\" JOIN
399    \e?         pass the PCRE_NO_UTF8_CHECK option to    \e?         pass the PCRE_NO_UTF8_CHECK option to
400                 \fBpcre_exec()\fP                 \fBpcre_exec()\fP or \fBpcre_dfa_exec()\fP
401    \e>dd       start the match at offset dd (any number of digits);    \e>dd       start the match at offset dd (any number of digits);
402    .\" JOIN
403                 this sets the \fIstartoffset\fP argument for \fBpcre_exec()\fP                 this sets the \fIstartoffset\fP argument for \fBpcre_exec()\fP
404                   or \fBpcre_dfa_exec()\fP
405    .\" JOIN
406      \e<cr>      pass the PCRE_NEWLINE_CR option to \fBpcre_exec()\fP
407                   or \fBpcre_dfa_exec()\fP
408    .\" JOIN
409      \e<lf>      pass the PCRE_NEWLINE_LF option to \fBpcre_exec()\fP
410                   or \fBpcre_dfa_exec()\fP
411    .\" JOIN
412      \e<crlf>    pass the PCRE_NEWLINE_CRLF option to \fBpcre_exec()\fP
413                   or \fBpcre_dfa_exec()\fP
414    .\" JOIN
415      \e<anycrlf> pass the PCRE_NEWLINE_ANYCRLF option to \fBpcre_exec()\fP
416                   or \fBpcre_dfa_exec()\fP
417    .\" JOIN
418      \e<any>     pass the PCRE_NEWLINE_ANY option to \fBpcre_exec()\fP
419                   or \fBpcre_dfa_exec()\fP
420  .sp  .sp
421  A backslash followed by anything else just escapes the anything else. If the  The escapes that specify line ending sequences are literal strings, exactly as
422  very last character is a backslash, it is ignored. This gives a way of passing  shown. No more than one newline setting should be present in any data line.
423  an empty line as data, since a real empty line terminates the data input.  .P
424    A backslash followed by anything else just escapes the anything else. If
425    the very last character is a backslash, it is ignored. This gives a way of
426    passing an empty line as data, since a real empty line terminates the data
427    input.
428  .P  .P
429  If \eM is present, \fBpcretest\fP calls \fBpcre_exec()\fP several times, with  If \eM is present, \fBpcretest\fP calls \fBpcre_exec()\fP several times, with
430  different values in the \fImatch_limit\fP and \fImatch_limit_recursion\fP  different values in the \fImatch_limit\fP and \fImatch_limit_recursion\fP
# Line 318  by the \fB-O\fP command line option (or Line 443  by the \fB-O\fP command line option (or
443  the call of \fBpcre_exec()\fP for the line in which it appears.  the call of \fBpcre_exec()\fP for the line in which it appears.
444  .P  .P
445  If the \fB/P\fP modifier was present on the pattern, causing the POSIX wrapper  If the \fB/P\fP modifier was present on the pattern, causing the POSIX wrapper
446  API to be used, the only option-setting sequences that have any effect are \eB  API to be used, the only option-setting sequences that have any effect are \eB,
447  and \eZ, causing REG_NOTBOL and REG_NOTEOL, respectively, to be passed to  \eN, and \eZ, causing REG_NOTBOL, REG_NOTEMPTY, and REG_NOTEOL, respectively,
448  \fBregexec()\fP.  to be passed to \fBregexec()\fP.
449  .P  .P
450  The use of \ex{hh...} to represent UTF-8 characters is not dependent on the use  The use of \ex{hh...} to represent UTF-8 characters is not dependent on the use
451  of the \fB/8\fP modifier on the pattern. It is recognized always. There may be  of the \fB/8\fP modifier on the pattern. It is recognized always. There may be
452  any number of hexadecimal digits inside the braces. The result is from one to  any number of hexadecimal digits inside the braces. The result is from one to
453  six bytes, encoded according to the UTF-8 rules.  six bytes, encoded according to the original UTF-8 rules of RFC 2279. This
454    allows for values in the range 0 to 0x7FFFFFFF. Note that not all of those are
455    valid Unicode code points, or indeed valid UTF-8 characters according to the
456    later rules in RFC 3629.
457  .  .
458  .  .
459  .SH "THE ALTERNATIVE MATCHING FUNCTION"  .SH "THE ALTERNATIVE MATCHING FUNCTION"
# Line 356  This section describes the output when t Line 484  This section describes the output when t
484  .P  .P
485  When a match succeeds, pcretest outputs the list of captured substrings that  When a match succeeds, pcretest outputs the list of captured substrings that
486  \fBpcre_exec()\fP returns, starting with number 0 for the string that matched  \fBpcre_exec()\fP returns, starting with number 0 for the string that matched
487  the whole pattern. Otherwise, it outputs "No match" or "Partial match"  the whole pattern. Otherwise, it outputs "No match" when the return is
488  when \fBpcre_exec()\fP returns PCRE_ERROR_NOMATCH or PCRE_ERROR_PARTIAL,  PCRE_ERROR_NOMATCH, and "Partial match:" followed by the partially matching
489  respectively, and otherwise the PCRE negative error number. Here is an example  substring when \fBpcre_exec()\fP returns PCRE_ERROR_PARTIAL. For any other
490  of an interactive \fBpcretest\fP run.  returns, it outputs the PCRE negative error number. Here is an example of an
491    interactive \fBpcretest\fP run.
492  .sp  .sp
493    $ pcretest    $ pcretest
494    PCRE version 5.00 07-Sep-2004    PCRE version 7.0 30-Nov-2006
495  .sp  .sp
496      re> /^abc(\ed+)/      re> /^abc(\ed+)/
497    data> abc123    data> abc123
# Line 371  of an interactive \fBpcretest\fP run. Line 500  of an interactive \fBpcretest\fP run.
500    data> xyz    data> xyz
501    No match    No match
502  .sp  .sp
503    Note that unset capturing substrings that are not followed by one that is set
504    are not returned by \fBpcre_exec()\fP, and are not shown by \fBpcretest\fP. In
505    the following example, there are two capturing substrings, but when the first
506    data line is matched, the second, unset substring is not shown. An "internal"
507    unset substring is shown as "<unset>", as for the second data line.
508    .sp
509        re> /(a)|(b)/
510      data> a
511       0: a
512       1: a
513      data> b
514       0: b
515       1: <unset>
516       2: b
517    .sp
518  If the strings contain any non-printing characters, they are output as \e0x  If the strings contain any non-printing characters, they are output as \e0x
519  escapes, or as \ex{...} escapes if the \fB/8\fP modifier was present on the  escapes, or as \ex{...} escapes if the \fB/8\fP modifier was present on the
520  pattern. If the pattern has the \fB/+\fP modifier, the output for substring 0  pattern. See below for the definition of non-printing characters. If the
521  is followed by the the rest of the subject string, identified by "0+" like  pattern has the \fB/+\fP modifier, the output for substring 0 is followed by
522  this:  the the rest of the subject string, identified by "0+" like this:
523  .sp  .sp
524      re> /cat/+      re> /cat/+
525    data> cataract    data> cataract
# Line 403  instead of a colon. This is in addition Line 547  instead of a colon. This is in addition
547  length (that is, the return from the extraction function) is given in  length (that is, the return from the extraction function) is given in
548  parentheses after each string for \fB\eC\fP and \fB\eG\fP.  parentheses after each string for \fB\eC\fP and \fB\eG\fP.
549  .P  .P
550  Note that while patterns can be continued over several lines (a plain ">"  Note that whereas patterns can be continued over several lines (a plain ">"
551  prompt is used for continuations), data lines may not. However newlines can be  prompt is used for continuations), data lines may not. However newlines can be
552  included in data by means of the \en escape.  included in data by means of the \en escape (or \er, \er\en, etc., depending on
553    the newline sequence setting).
554    .
555  .  .
556  .  .
557  .SH "OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION"  .SH "OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION"
# Line 423  the subject where there is at least one Line 569  the subject where there is at least one
569     2: tan     2: tan
570  .sp  .sp
571  (Using the normal matching function on this data finds only "tang".) The  (Using the normal matching function on this data finds only "tang".) The
572  longest matching string is always given first (and numbered zero).  longest matching string is always given first (and numbered zero). After a
573    PCRE_ERROR_PARTIAL return, the output is "Partial match:", followed by the
574    partially matching substring.
575  .P  .P
576  If \fB/g\P is present on the pattern, the search for further matches resumes  If \fB/g\fP is present on the pattern, the search for further matches resumes
577  at the end of the longest match. For example:  at the end of the longest match. For example:
578  .sp  .sp
579      re> /(tang|tangerine|tan)/g      re> /(tang|tangerine|tan)/g
# Line 449  indicating that the subject partially ma Line 597  indicating that the subject partially ma
597  match with additional subject data by means of the \eR escape sequence. For  match with additional subject data by means of the \eR escape sequence. For
598  example:  example:
599  .sp  .sp
600      re> /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/      re> /^\ed?\ed(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\ed\ed$/
601    data> 23ja\eP\eD    data> 23ja\eP\eD
602    Partial match: 23ja    Partial match: 23ja
603    data> n05\eR\eD    data> n05\eR\eD
# Line 506  the Line 654  the
654  documentation.  documentation.
655  .  .
656  .  .
657    .
658    .SH "NON-PRINTING CHARACTERS"
659    .rs
660    .sp
661    When \fBpcretest\fP is outputting text in the compiled version of a pattern,
662    bytes other than 32-126 are always treated as non-printing characters are are
663    therefore shown as hex escapes.
664    .P
665    When \fBpcretest\fP is outputting text that is a matched part of a subject
666    string, it behaves in the same way, unless a different locale has been set for
667    the pattern (using the \fB/L\fP modifier). In this case, the \fBisprint()\fP
668    function to distinguish printing and non-printing characters.
669    .
670    .
671    .
672  .SH "SAVING AND RELOADING COMPILED PATTERNS"  .SH "SAVING AND RELOADING COMPILED PATTERNS"
673  .rs  .rs
674  .sp  .sp
# Line 566  Finally, if you attempt to load a file t Line 729  Finally, if you attempt to load a file t
729  result is undefined.  result is undefined.
730  .  .
731  .  .
732    .SH "SEE ALSO"
733    .rs
734    .sp
735    \fBpcre\fP(3), \fBpcreapi\fP(3), \fBpcrecallout\fP(3), \fBpcrematching\fP(3),
736    \fBpcrepartial\fP(d), \fBpcrepattern\fP(3), \fBpcreprecompile\fP(3).
737    .
738    .
739  .SH AUTHOR  .SH AUTHOR
740  .rs  .rs
741  .sp  .sp
742    .nf
743  Philip Hazel  Philip Hazel
744  .br  University Computing Service
745  University Computing Service,  Cambridge CB2 3QH, England.
746  .br  .fi
747  Cambridge CB2 3QG, England.  .
748  .P  .
749  .in 0  .SH REVISION
750  Last updated: 18 January 2006  .rs
751  .br  .sp
752  Copyright (c) 1997-2006 University of Cambridge.  .nf
753    Last updated: 16 May 2010
754    Copyright (c) 1997-2010 University of Cambridge.
755    .fi

Legend:
Removed from v.87  
changed lines
  Added in v.518

  ViewVC Help
Powered by ViewVC 1.1.5