/[pcre]/code/trunk/doc/pcretest.txt
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revision 211 by ph10, Thu Aug 9 09:52:43 2007 UTC revision 392 by ph10, Tue Mar 17 21:30:30 2009 UTC
# Line 40  OPTIONS Line 40  OPTIONS
40         -i        Behave as if each regex  has  the  /I  modifier;  information         -i        Behave as if each regex  has  the  /I  modifier;  information
41                   about the compiled pattern is given after compilation.                   about the compiled pattern is given after compilation.
42    
43         -m        Output  the  size  of each compiled pattern after it has been         -M        Behave  as if each data line contains the \M escape sequence;
44                   compiled. This is equivalent to adding  /M  to  each  regular                   this causes PCRE to  discover  the  minimum  MATCH_LIMIT  and
45                   expression.   For  compatibility  with  earlier  versions  of                   MATCH_LIMIT_RECURSION settings by calling pcre_exec() repeat-
46                     edly with different limits.
47    
48           -m        Output the size of each compiled pattern after  it  has  been
49                     compiled.  This  is  equivalent  to adding /M to each regular
50                     expression.  For  compatibility  with  earlier  versions   of
51                   pcretest, -s is a synonym for -m.                   pcretest, -s is a synonym for -m.
52    
53         -o osize  Set the number of elements in the output vector that is  used         -o osize  Set  the number of elements in the output vector that is used
54                   when  calling pcre_exec() or pcre_dfa_exec() to be osize. The                   when calling pcre_exec() or pcre_dfa_exec() to be osize.  The
55                   default value is 45, which is enough for 14 capturing  subex-                   default  value is 45, which is enough for 14 capturing subex-
56                   pressions   for  pcre_exec()  or  22  different  matches  for                   pressions  for  pcre_exec()  or  22  different  matches   for
57                   pcre_dfa_exec(). The vector size can be changed for  individ-                   pcre_dfa_exec().  The vector size can be changed for individ-
58                   ual  matching  calls  by  including  \O in the data line (see                   ual matching calls by including \O  in  the  data  line  (see
59                   below).                   below).
60    
61         -p        Behave as if each regex has the /P modifier; the POSIX  wrap-         -p        Behave  as if each regex has the /P modifier; the POSIX wrap-
62                   per  API  is used to call PCRE. None of the other options has                   per API is used to call PCRE. None of the other  options  has
63                   any effect when -p is set.                   any effect when -p is set.
64    
65         -q        Do not output the version number of pcretest at the start  of         -q        Do  not output the version number of pcretest at the start of
66                   execution.                   execution.
67    
68         -S size   On  Unix-like  systems,  set the size of the runtime stack to         -S size   On Unix-like systems, set the size of the  runtime  stack  to
69                   size megabytes.                   size megabytes.
70    
71         -t        Run each compile, study, and match many times with  a  timer,         -t        Run  each  compile, study, and match many times with a timer,
72                   and  output resulting time per compile or match (in millisec-                   and output resulting time per compile or match (in  millisec-
73                   onds). Do not set -m with -t, because you will then  get  the                   onds).  Do  not set -m with -t, because you will then get the
74                   size  output  a  zillion  times,  and the timing will be dis-                   size output a zillion times, and  the  timing  will  be  dis-
75                   torted. You can control the number  of  iterations  that  are                   torted.  You  can  control  the number of iterations that are
76                   used  for timing by following -t with a number (as a separate                   used for timing by following -t with a number (as a  separate
77                   item on the command line). For example, "-t 1000" would iter-                   item on the command line). For example, "-t 1000" would iter-
78                   ate 1000 times. The default is to iterate 500000 times.                   ate 1000 times. The default is to iterate 500000 times.
79    
# Line 78  OPTIONS Line 83  OPTIONS
83    
84  DESCRIPTION  DESCRIPTION
85    
86         If pcretest is given two filename arguments, it reads  from  the  first         If  pcretest  is  given two filename arguments, it reads from the first
87         and writes to the second. If it is given only one filename argument, it         and writes to the second. If it is given only one filename argument, it
88         reads from that file and writes to stdout.  Otherwise,  it  reads  from         reads  from  that  file  and writes to stdout. Otherwise, it reads from
89         stdin  and  writes to stdout, and prompts for each line of input, using         stdin and writes to stdout, and prompts for each line of  input,  using
90         "re>" to prompt for regular expressions, and "data>" to prompt for data         "re>" to prompt for regular expressions, and "data>" to prompt for data
91         lines.         lines.
92    
93           When pcretest is built, a configuration  option  can  specify  that  it
94           should  be  linked  with the libreadline library. When this is done, if
95           the input is from a terminal, it is read using the readline() function.
96           This  provides line-editing and history facilities. The output from the
97           -help option states whether or not readline() will be used.
98    
99         The program handles any number of sets of input on a single input file.         The program handles any number of sets of input on a single input file.
100         Each set starts with a regular expression, and continues with any  num-         Each  set starts with a regular expression, and continues with any num-
101         ber of data lines to be matched against the pattern.         ber of data lines to be matched against the pattern.
102    
103         Each  data line is matched separately and independently. If you want to         Each data line is matched separately and independently. If you want  to
104         do multi-line matches, you have to use the \n escape sequence (or \r or         do multi-line matches, you have to use the \n escape sequence (or \r or
105         \r\n, etc., depending on the newline setting) in a single line of input         \r\n, etc., depending on the newline setting) in a single line of input
106         to encode the newline sequences. There is no limit  on  the  length  of         to  encode  the  newline  sequences. There is no limit on the length of
107         data  lines;  the  input  buffer is automatically extended if it is too         data lines; the input buffer is automatically extended  if  it  is  too
108         small.         small.
109    
110         An empty line signals the end of the data lines, at which point  a  new         An  empty  line signals the end of the data lines, at which point a new
111         regular  expression is read. The regular expressions are given enclosed         regular expression is read. The regular expressions are given  enclosed
112         in any non-alphanumeric delimiters other than backslash, for example:         in any non-alphanumeric delimiters other than backslash, for example:
113    
114           /(a|bc)x+yz/           /(a|bc)x+yz/
115    
116         White space before the initial delimiter is ignored. A regular  expres-         White  space before the initial delimiter is ignored. A regular expres-
117         sion  may be continued over several input lines, in which case the new-         sion may be continued over several input lines, in which case the  new-
118         line characters are included within it. It is possible to  include  the         line  characters  are included within it. It is possible to include the
119         delimiter within the pattern by escaping it, for example         delimiter within the pattern by escaping it, for example
120    
121           /abc\/def/           /abc\/def/
122    
123         If  you  do  so, the escape and the delimiter form part of the pattern,         If you do so, the escape and the delimiter form part  of  the  pattern,
124         but since delimiters are always non-alphanumeric, this does not  affect         but  since delimiters are always non-alphanumeric, this does not affect
125         its  interpretation.   If the terminating delimiter is immediately fol-         its interpretation.  If the terminating delimiter is  immediately  fol-
126         lowed by a backslash, for example,         lowed by a backslash, for example,
127    
128           /abc/\           /abc/\
129    
130         then a backslash is added to the end of the pattern. This  is  done  to         then  a  backslash  is added to the end of the pattern. This is done to
131         provide  a  way of testing the error condition that arises if a pattern         provide a way of testing the error condition that arises if  a  pattern
132         finishes with a backslash, because         finishes with a backslash, because
133    
134           /abc\/           /abc\/
135    
136         is interpreted as the first line of a pattern that starts with  "abc/",         is  interpreted as the first line of a pattern that starts with "abc/",
137         causing pcretest to read the next line as a continuation of the regular         causing pcretest to read the next line as a continuation of the regular
138         expression.         expression.
139    
140    
141  PATTERN MODIFIERS  PATTERN MODIFIERS
142    
143         A pattern may be followed by any number of modifiers, which are  mostly         A  pattern may be followed by any number of modifiers, which are mostly
144         single  characters.  Following  Perl usage, these are referred to below         single characters. Following Perl usage, these are  referred  to  below
145         as, for example, "the /i modifier", even though the  delimiter  of  the         as,  for  example,  "the /i modifier", even though the delimiter of the
146         pattern  need  not always be a slash, and no slash is used when writing         pattern need not always be a slash, and no slash is used  when  writing
147         modifiers. Whitespace may appear between the  final  pattern  delimiter         modifiers.  Whitespace  may  appear between the final pattern delimiter
148         and the first modifier, and between the modifiers themselves.         and the first modifier, and between the modifiers themselves.
149    
150         The /i, /m, /s, and /x modifiers set the PCRE_CASELESS, PCRE_MULTILINE,         The /i, /m, /s, and /x modifiers set the PCRE_CASELESS, PCRE_MULTILINE,
151         PCRE_DOTALL, or PCRE_EXTENDED  options,  respectively,  when  pcre_com-         PCRE_DOTALL,  or  PCRE_EXTENDED  options,  respectively, when pcre_com-
152         pile()  is  called. These four modifier letters have the same effect as         pile() is called. These four modifier letters have the same  effect  as
153         they do in Perl. For example:         they do in Perl. For example:
154    
155           /caseless/i           /caseless/i
# Line 146  PATTERN MODIFIERS Line 157  PATTERN MODIFIERS
157         The following table shows additional modifiers for setting PCRE options         The following table shows additional modifiers for setting PCRE options
158         that do not correspond to anything in Perl:         that do not correspond to anything in Perl:
159    
160           /A          PCRE_ANCHORED           /A              PCRE_ANCHORED
161           /C          PCRE_AUTO_CALLOUT           /C              PCRE_AUTO_CALLOUT
162           /E          PCRE_DOLLAR_ENDONLY           /E              PCRE_DOLLAR_ENDONLY
163           /f          PCRE_FIRSTLINE           /f              PCRE_FIRSTLINE
164           /J          PCRE_DUPNAMES           /J              PCRE_DUPNAMES
165           /N          PCRE_NO_AUTO_CAPTURE           /N              PCRE_NO_AUTO_CAPTURE
166           /U          PCRE_UNGREEDY           /U              PCRE_UNGREEDY
167           /X          PCRE_EXTRA           /X              PCRE_EXTRA
168           /<cr>       PCRE_NEWLINE_CR           /<JS>           PCRE_JAVASCRIPT_COMPAT
169           /<lf>       PCRE_NEWLINE_LF           /<cr>           PCRE_NEWLINE_CR
170           /<crlf>     PCRE_NEWLINE_CRLF           /<lf>           PCRE_NEWLINE_LF
171           /<anycrlf>  PCRE_NEWLINE_ANYCRLF           /<crlf>         PCRE_NEWLINE_CRLF
172           /<any>      PCRE_NEWLINE_ANY           /<anycrlf>      PCRE_NEWLINE_ANYCRLF
173             /<any>          PCRE_NEWLINE_ANY
174         Those  specifying  line ending sequencess are literal strings as shown.           /<bsr_anycrlf>  PCRE_BSR_ANYCRLF
175         This example sets multiline matching  with  CRLF  as  the  line  ending           /<bsr_unicode>  PCRE_BSR_UNICODE
176         sequence:  
177           Those specifying line ending sequences are literal  strings  as  shown,
178           but  the  letters  can  be  in either case. This example sets multiline
179           matching with CRLF as the line ending sequence:
180    
181           /^abc/m<crlf>           /^abc/m<crlf>
182    
183         Details  of the meanings of these PCRE options are given in the pcreapi         Details of the meanings of these PCRE options are given in the  pcreapi
184         documentation.         documentation.
185    
186     Finding all matches in a string     Finding all matches in a string
187    
188         Searching for all possible matches within each subject  string  can  be         Searching  for  all  possible matches within each subject string can be
189         requested  by  the  /g  or  /G modifier. After finding a match, PCRE is         requested by the /g or /G modifier. After  finding  a  match,  PCRE  is
190         called again to search the remainder of the subject string. The differ-         called again to search the remainder of the subject string. The differ-
191         ence between /g and /G is that the former uses the startoffset argument         ence between /g and /G is that the former uses the startoffset argument
192         to pcre_exec() to start searching at a  new  point  within  the  entire         to  pcre_exec()  to  start  searching  at a new point within the entire
193         string  (which  is in effect what Perl does), whereas the latter passes         string (which is in effect what Perl does), whereas the  latter  passes
194         over a shortened substring. This makes a  difference  to  the  matching         over  a  shortened  substring.  This makes a difference to the matching
195         process if the pattern begins with a lookbehind assertion (including \b         process if the pattern begins with a lookbehind assertion (including \b
196         or \B).         or \B).
197    
198         If any call to pcre_exec() in a /g or  /G  sequence  matches  an  empty         If  any  call  to  pcre_exec()  in a /g or /G sequence matches an empty
199         string,  the next call is done with the PCRE_NOTEMPTY and PCRE_ANCHORED         string, the next call is done with the PCRE_NOTEMPTY and  PCRE_ANCHORED
200         flags set in order to search for another, non-empty, match at the  same         flags  set in order to search for another, non-empty, match at the same
201         point.   If  this  second  match fails, the start offset is advanced by         point.  If this second match fails, the start  offset  is  advanced  by
202         one, and the normal match is retried. This imitates the way  Perl  han-         one,  and  the normal match is retried. This imitates the way Perl han-
203         dles such cases when using the /g modifier or the split() function.         dles such cases when using the /g modifier or the split() function.
204    
205     Other modifiers     Other modifiers
# Line 236  PATTERN MODIFIERS Line 250  PATTERN MODIFIERS
250         The  /S  modifier causes pcre_study() to be called after the expression         The  /S  modifier causes pcre_study() to be called after the expression
251         has been compiled, and the results used when the expression is matched.         has been compiled, and the results used when the expression is matched.
252    
253         The  /M  modifier causes the size of memory block used to hold the com-         The /M modifier causes the size of memory block used to hold  the  com-
254         piled pattern to be output.         piled pattern to be output.
255    
256         The /P modifier causes pcretest to call PCRE via the POSIX wrapper  API         The  /P modifier causes pcretest to call PCRE via the POSIX wrapper API
257         rather  than  its  native  API.  When this is done, all other modifiers         rather than its native API. When this  is  done,  all  other  modifiers
258         except /i, /m, and /+ are ignored. REG_ICASE is set if /i  is  present,         except  /i,  /m, and /+ are ignored. REG_ICASE is set if /i is present,
259         and  REG_NEWLINE  is  set if /m is present. The wrapper functions force         and REG_NEWLINE is set if /m is present. The  wrapper  functions  force
260         PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is  set.         PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is set.
261    
262         The  /8 modifier causes pcretest to call PCRE with the PCRE_UTF8 option         The  /8 modifier causes pcretest to call PCRE with the PCRE_UTF8 option
263         set. This turns on support for UTF-8 character handling in  PCRE,  pro-         set. This turns on support for UTF-8 character handling in  PCRE,  pro-
# Line 413  DEFAULT OUTPUT FROM PCRETEST Line 427  DEFAULT OUTPUT FROM PCRETEST
427           data> xyz           data> xyz
428           No match           No match
429    
430         If  the strings contain any non-printing characters, they are output as         Note  that unset capturing substrings that are not followed by one that
431         \0x escapes, or as \x{...} escapes if the /8 modifier  was  present  on         is set are not returned by pcre_exec(), and are not shown by  pcretest.
432         the  pattern.  See below for the definition of non-printing characters.         In  the following example, there are two capturing substrings, but when
433         If the pattern has the /+ modifier, the output for substring 0 is  fol-         the first data line is matched, the  second,  unset  substring  is  not
434         lowed  by  the  the rest of the subject string, identified by "0+" like         shown.  An "internal" unset substring is shown as "<unset>", as for the
435           second data line.
436    
437               re> /(a)|(b)/
438             data> a
439              0: a
440              1: a
441             data> b
442              0: b
443              1: <unset>
444              2: b
445    
446           If the strings contain any non-printing characters, they are output  as
447           \0x  escapes,  or  as \x{...} escapes if the /8 modifier was present on
448           the pattern. See below for the definition of  non-printing  characters.
449           If  the pattern has the /+ modifier, the output for substring 0 is fol-
450           lowed by the the rest of the subject string, identified  by  "0+"  like
451         this:         this:
452    
453             re> /cat/+             re> /cat/+
# Line 425  DEFAULT OUTPUT FROM PCRETEST Line 455  DEFAULT OUTPUT FROM PCRETEST
455            0: cat            0: cat
456            0+ aract            0+ aract
457    
458         If the pattern has the /g or /G modifier,  the  results  of  successive         If  the  pattern  has  the /g or /G modifier, the results of successive
459         matching attempts are output in sequence, like this:         matching attempts are output in sequence, like this:
460    
461             re> /\Bi(\w\w)/g             re> /\Bi(\w\w)/g
# Line 439  DEFAULT OUTPUT FROM PCRETEST Line 469  DEFAULT OUTPUT FROM PCRETEST
469    
470         "No match" is output only if the first match attempt fails.         "No match" is output only if the first match attempt fails.
471    
472         If  any  of the sequences \C, \G, or \L are present in a data line that         If any of the sequences \C, \G, or \L are present in a data  line  that
473         is successfully matched, the substrings extracted  by  the  convenience         is  successfully  matched,  the substrings extracted by the convenience
474         functions are output with C, G, or L after the string number instead of         functions are output with C, G, or L after the string number instead of
475         a colon. This is in addition to the normal full list. The string length         a colon. This is in addition to the normal full list. The string length
476         (that  is,  the return from the extraction function) is given in paren-         (that is, the return from the extraction function) is given  in  paren-
477         theses after each string for \C and \G.         theses after each string for \C and \G.
478    
479         Note that whereas patterns can be continued over several lines (a plain         Note that whereas patterns can be continued over several lines (a plain
480         ">" prompt is used for continuations), data lines may not. However new-         ">" prompt is used for continuations), data lines may not. However new-
481         lines can be included in data by means of the \n escape (or  \r,  \r\n,         lines  can  be included in data by means of the \n escape (or \r, \r\n,
482         etc., depending on the newline sequence setting).         etc., depending on the newline sequence setting).
483    
484    
485  OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION  OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
486    
487         When  the  alternative  matching function, pcre_dfa_exec(), is used (by         When the alternative matching function, pcre_dfa_exec(),  is  used  (by
488         means of the \D escape sequence or the -dfa command line  option),  the         means  of  the \D escape sequence or the -dfa command line option), the
489         output  consists  of  a list of all the matches that start at the first         output consists of a list of all the matches that start  at  the  first
490         point in the subject where there is at least one match. For example:         point in the subject where there is at least one match. For example:
491    
492             re> /(tang|tangerine|tan)/             re> /(tang|tangerine|tan)/
# Line 465  OUTPUT FROM THE ALTERNATIVE MATCHING FUN Line 495  OUTPUT FROM THE ALTERNATIVE MATCHING FUN
495            1: tang            1: tang
496            2: tan            2: tan
497    
498         (Using the normal matching function on this data  finds  only  "tang".)         (Using  the  normal  matching function on this data finds only "tang".)
499         The  longest matching string is always given first (and numbered zero).         The longest matching string is always given first (and numbered zero).
500    
501         If /g is present on the pattern, the search for further matches resumes         If /g is present on the pattern, the search for further matches resumes
502         at the end of the longest match. For example:         at the end of the longest match. For example:
# Line 556  NON-PRINTING CHARACTERS Line 586  NON-PRINTING CHARACTERS
586    
587  SAVING AND RELOADING COMPILED PATTERNS  SAVING AND RELOADING COMPILED PATTERNS
588    
589         The facilities described in this section are  not  available  when  the         The  facilities  described  in  this section are not available when the
590         POSIX inteface to PCRE is being used, that is, when the /P pattern mod-         POSIX inteface to PCRE is being used, that is, when the /P pattern mod-
591         ifier is specified.         ifier is specified.
592    
593         When the POSIX interface is not in use, you can cause pcretest to write         When the POSIX interface is not in use, you can cause pcretest to write
594         a  compiled  pattern to a file, by following the modifiers with > and a         a compiled pattern to a file, by following the modifiers with >  and  a
595         file name.  For example:         file name.  For example:
596    
597           /pattern/im >/some/file           /pattern/im >/some/file
598    
599         See the pcreprecompile documentation for a discussion about saving  and         See  the pcreprecompile documentation for a discussion about saving and
600         re-using compiled patterns.         re-using compiled patterns.
601    
602         The  data  that  is  written  is  binary. The first eight bytes are the         The data that is written is binary.  The  first  eight  bytes  are  the
603         length of the compiled pattern data  followed  by  the  length  of  the         length  of  the  compiled  pattern  data  followed by the length of the
604         optional  study  data,  each  written as four bytes in big-endian order         optional study data, each written as four  bytes  in  big-endian  order
605         (most significant byte first). If there is no study  data  (either  the         (most  significant  byte  first). If there is no study data (either the
606         pattern was not studied, or studying did not return any data), the sec-         pattern was not studied, or studying did not return any data), the sec-
607         ond length is zero. The lengths are followed by an exact  copy  of  the         ond  length  is  zero. The lengths are followed by an exact copy of the
608         compiled pattern. If there is additional study data, this follows imme-         compiled pattern. If there is additional study data, this follows imme-
609         diately after the compiled pattern. After writing  the  file,  pcretest         diately  after  the  compiled pattern. After writing the file, pcretest
610         expects to read a new pattern.         expects to read a new pattern.
611    
612         A saved pattern can be reloaded into pcretest by specifing < and a file         A saved pattern can be reloaded into pcretest by specifing < and a file
613         name instead of a pattern. The name of the file must not  contain  a  <         name  instead  of  a pattern. The name of the file must not contain a <
614         character,  as  otherwise pcretest will interpret the line as a pattern         character, as otherwise pcretest will interpret the line as  a  pattern
615         delimited by < characters.  For example:         delimited by < characters.  For example:
616    
617            re> </some/file            re> </some/file
618           Compiled regex loaded from /some/file           Compiled regex loaded from /some/file
619           No study data           No study data
620    
621         When the pattern has been loaded, pcretest proceeds to read data  lines         When  the pattern has been loaded, pcretest proceeds to read data lines
622         in the usual way.         in the usual way.
623    
624         You  can copy a file written by pcretest to a different host and reload         You can copy a file written by pcretest to a different host and  reload
625         it there, even if the new host has opposite endianness to  the  one  on         it  there,  even  if the new host has opposite endianness to the one on
626         which  the pattern was compiled. For example, you can compile on an i86         which the pattern was compiled. For example, you can compile on an  i86
627         machine and run on a SPARC machine.         machine and run on a SPARC machine.
628    
629         File names for saving and reloading can be absolute  or  relative,  but         File  names  for  saving and reloading can be absolute or relative, but
630         note  that the shell facility of expanding a file name that starts with         note that the shell facility of expanding a file name that starts  with
631         a tilde (~) is not available.         a tilde (~) is not available.
632    
633         The ability to save and reload files in pcretest is intended for  test-         The  ability to save and reload files in pcretest is intended for test-
634         ing  and experimentation. It is not intended for production use because         ing and experimentation. It is not intended for production use  because
635         only a single pattern can be written to a file. Furthermore,  there  is         only  a  single pattern can be written to a file. Furthermore, there is
636         no  facility  for  supplying  custom  character  tables  for use with a         no facility for supplying  custom  character  tables  for  use  with  a
637         reloaded pattern. If the original  pattern  was  compiled  with  custom         reloaded  pattern.  If  the  original  pattern was compiled with custom
638         tables,  an  attempt to match a subject string using a reloaded pattern         tables, an attempt to match a subject string using a  reloaded  pattern
639         is likely to cause pcretest to crash.  Finally, if you attempt to  load         is  likely to cause pcretest to crash.  Finally, if you attempt to load
640         a file that is not in the correct format, the result is undefined.         a file that is not in the correct format, the result is undefined.
641    
642    
643  SEE ALSO  SEE ALSO
644    
645         pcre(3),  pcreapi(3),  pcrecallout(3), pcrematching(3), pcrepartial(d),         pcre(3), pcreapi(3), pcrecallout(3),  pcrematching(3),  pcrepartial(d),
646         pcrepattern(3), pcreprecompile(3).         pcrepattern(3), pcreprecompile(3).
647    
648    
# Line 625  AUTHOR Line 655  AUTHOR
655    
656  REVISION  REVISION
657    
658         Last updated: 09 August 2007         Last updated: 10 March 2009
659         Copyright (c) 1997-2007 University of Cambridge.         Copyright (c) 1997-2009 University of Cambridge.

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