/[pcre]/code/tags/pcre-5.0/doc/pcretest.txt

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+revision 63 by nigel,
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 NAME
       expressions.
  SYNOPSIS
       pcretest [-d] [-i] [-m] [-o osize] [-p] [-t] [source]  [des-
       tination]
       pcretest was written as a test program for the PCRE  regular
       expression  library  itself,  but  it  can  also be used for
-      experimenting  with  regular  expressions.  This  man   page
+      experimenting  with  regular  expressions.   This   document
       describes  the  features of the test program; for details of
-      the regular expressions themselves, see the pcre man page.
+      the regular  expressions  themselves,  see  the  pcrepattern
+      documentation.  For details of PCRE and its options, see the
+      pcreapi documentation.
  OPTIONS
+      -C        Output the version number of the PCRE library, and
+                all   available  information  about  the  optional
+                features that are included, and then exit.
       -d        Behave as if each regex had the /D  modifier  (see
                 below); the internal form is output after compila-
                 tion.
-Line 42 
 OPTIONS
+Line 48 
 OPTIONS
                 wrapper  API  is  used  to  call PCRE. None of the
                 other options has any effect when -p is set.
-      -t        Run each compile, study,  and  match  20000  times
+      -t        Run each compile, study, and match many times with
-                with  a  timer, and output resulting time per com-
+                a  timer, and output resulting time per compile or
-                pile or match (in milliseconds).  Do  not  set  -t
+                match (in milliseconds). Do not set  -t  with  -m,
-                with -m, because you will then get the size output
+                because  you  will  then get the size output 20000
-times and the timing will be distorted.
+                times and the timing will be distorted.
  DESCRIPTION
       If pcretest is given two filename arguments, it  reads  from
       the  first and writes to the second. If it is given only one
- SunOS 5.8                 Last change:                          1
       filename argument, it reads from that  file  and  writes  to
       stdout. Otherwise, it reads from stdin and writes to stdout,
       and prompts for each line of input, using  "re>"  to  prompt
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       The program handles any number of sets of input on a  single
       input  file.  Each set starts with a regular expression, and
       continues with any  number  of  data  lines  to  be  matched
-      against  the  pattern.  An empty line signals the end of the
+      against the pattern.
-      data lines, at which point a new regular expression is read.
-      The  regular  expressions  are  given  enclosed  in any non-
+      Each line is matched separately and  independently.  If  you
-      alphameric delimiters other than backslash, for example
+      want  to  do  multiple-line  matches, you have to use the \n
+      escape sequence in a single line of input to encode the new-
+      line  characters.  The maximum length of data line is 30,000
+      characters.
+      An empty line signals the end of the data  lines,  at  which
+      point  a new regular expression is read. The regular expres-
+      sions are given enclosed in  any  non-alphameric  delimiters
+      other than backslash, for example
         /(a|bc)x+yz/
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       continuation of the regular expression.
  PATTERN MODIFIERS
       The pattern may be followed by i, m, s,  or  x  to  set  the
       PCRE_CASELESS, PCRE_MULTILINE, PCRE_DOTALL, or PCRE_EXTENDED
       options, respectively. For example:
-Line 165 
 PATTERN MODIFIERS
+Line 171 
 PATTERN MODIFIERS
       pcre_fullinfo()  after  compiling an expression, and output-
       ting the information it gets back. If the  pattern  is  stu-
       died, the results of that are also output.
       The /D modifier is a  PCRE  debugging  feature,  which  also
       assumes /I.  It causes the internal form of compiled regular
-      expressions to be output after compilation.
+      expressions to be output after compilation. If  the  pattern
+      was studied, the information returned is also output.
       The /S modifier causes pcre_study() to be called  after  the
       expression  has been compiled, and the results used when the
-Line 185 
 PATTERN MODIFIERS
+Line 193 
 PATTERN MODIFIERS
       REG_NEWLINE is set.
       The /8 modifier  causes  pcretest  to  call  PCRE  with  the
-      PCRE_UTF8  option  set.  This turns on the (currently incom-
+      PCRE_UTF8  option set. This turns on support for UTF-8 char-
-      plete) support for UTF-8 character handling  in  PCRE,  pro-
+      acter handling in PCRE, provided that it was  compiled  with
-      vided  that  it was compiled with this support enabled. This
+      this  support  enabled.  This  modifier also causes any non-
-      modifier also causes any non-printing characters  in  output
+      printing characters in output strings to  be  printed  using
-      strings  to  be printed using the \x{hh...} notation if they
+      the \x{hh...} notation if they are valid UTF-8 sequences.
-      are valid UTF-8 sequences.
+ CALLOUTS
+      If the pattern contains  any  callout  requests,  pcretest's
+      callout function will be called. By default, it displays the
+      callout number, and the start and current positions  in  the
+      text at the callout time. For example, the output
+        --->pqrabcdef
+   ^  ^
+      indicates that callout number 0 occurred for a match attempt
+      starting at the fourth character of the subject string, when
+      the pointer was at the seventh character. The callout  func-
+      tion returns zero (carry on matching) by default.
+      Inserting callouts may be helpful  when  using  pcretest  to
+      check  complicated regular expressions. For further informa-
+      tion about callouts, see the pcrecallout documentation.
+      For testing the PCRE library, additional control of  callout
+      behaviour  is available via escape sequences in the data, as
+      described in the following section.  In  particular,  it  is
+      possible to pass in a number as callout data (the default is
+      zero). If the callout function receives a  non-zero  number,
+      it returns that value instead of zero.
  DATA LINES
       Before each data line is passed to pcre_exec(), leading  and
       trailing whitespace is removed, and it is then scanned for \
-      escapes. The following are recognized:
+      escapes.  Some  of  these  are  pretty  esoteric   features,
+      intended  for  checking  out  some  of  the more complicated
+      features of PCRE. If you are just testing "ordinary" regular
+      expressions,  you probably don't need any of these. The fol-
+      lowing escapes are recognized:
         \a         alarm (= BEL)
         \b         backspace
-Line 209 
 DATA LINES
+Line 247 
 DATA LINES
         \v         vertical tab
         \nnn       octal character (up to 3 octal digits)
         \xhh       hexadecimal character (up to 2 hex digits)
-        \x{hh...}  hexadecimal UTF-8 character
+        \x{hh...}  hexadecimal character, any number of digits
+                     in UTF-8 mode
         \A         pass the PCRE_ANCHORED option to pcre_exec()
         \B         pass the PCRE_NOTBOL option to pcre_exec()
         \Cdd       call pcre_copy_substring() for substring dd
-                      after a successful match (any decimal number
+                     after a successful match (any decimal number
-                      less than 32)
+                     less than 32)
+        \Cname     call pcre_copy_named_substring() for substring
+                     "name" after a successful match (name termin-
+                     ated by next non alphanumeric character)
+        \C+        show the current captured substrings at callout
+                     time
+        C-        do not supply a callout function
+        \C!n       return 1 instead of 0 when callout number n is
+                     reached
+        \C!n!m     return 1 instead of 0 when callout number n is
+                     reached for the nth time
+        \C*n       pass the number n (may be negative) as callout
+                     data
         \Gdd       call pcre_get_substring() for substring dd
+                     after a successful match (any decimal number
-                      after a successful match (any decimal number
+                     less than 32)
-                      less than 32)
+        \Gname     call pcre_get_named_substring() for substring
+                     "name" after a successful match (name termin-
+                     ated by next non-alphanumeric character)
         \L         call pcre_get_substringlist() after a
-                      successful match
+                     successful match
+        \M         discover the minimum MATCH_LIMIT setting
         \N         pass the PCRE_NOTEMPTY option to pcre_exec()
         \Odd       set the size of the output vector passed to
-                      pcre_exec() to dd (any number of decimal
+                     pcre_exec() to dd (any number of decimal
-                      digits)
+                     digits)
         \Z         pass the PCRE_NOTEOL option to pcre_exec()
+      If \M is present, pcretest calls pcre_exec() several  times,
+      with  different  values  in  the  match_limit  field  of the
+      pcre_extra data structure, until it finds the minimum number
+      that is needed for pcre_exec() to complete. This number is a
+      measure of the amount of  recursion  and  backtracking  that
+      takes  place,  and  checking  it out can be instructive. For
+      most simple matches, the number is quite small, but for pat-
+      terns  with very large numbers of matching possibilities, it
+      can become large very quickly with increasing length of sub-
+      ject string.
       When \O is used, it may be higher or lower than the size set
       by  the  -O  option (or defaulted to 45); \O applies only to
       the call of pcre_exec() for the line in which it appears.
-Line 249 
 DATA LINES
+Line 314 
 DATA LINES
       bytes, encoded according to the UTF-8 rules.
  OUTPUT FROM PCRETEST
       When a match succeeds, pcretest outputs the list of captured
       substrings  that pcre_exec() returns, starting with number 0
       for the string that matched the whole pattern.  Here  is  an
       example of an interactive pcretest run.
         $ pcretest
-        PCRE version 2.06 08-Jun-1999
+        PCRE version 4.00 08-Jan-2003
           re> /^abc(\d+)/
         data> abc123
-Line 307 
 OUTPUT FROM PCRETEST
+Line 372 
 OUTPUT FROM PCRETEST
       of the \n escape.
  AUTHOR
       Philip Hazel <ph10@cam.ac.uk>
       University Computing Service,
-      New Museums Site,
       Cambridge CB2 3QG, England.
-      Phone: +44 1223 334714
-      Last updated: 15 August 2001
+ Last updated: 03 February 2003
-      Copyright (c) 1997-2001 University of Cambridge.
+ Copyright (c) 1997-2003 University of Cambridge.

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