Implement -D whitelist invoking user restriction.

[users/jgh/exim.git] / doc / doc-txt / pcretest.txt

diff --git a/doc/doc-txt/pcretest.txt b/doc/doc-txt/pcretest.txt
index 695741daea34d69e737dee03f5fa0be99b186300..d93ec26d1d5c8b76ec73383217277173132d26b0 100644 (file)
--- a/doc/doc-txt/pcretest.txt
+++ b/doc/doc-txt/pcretest.txt
@@ -12,8 +12,7 @@ NAME
 
 SYNOPSIS
 
 
 SYNOPSIS
 

-       pcretest [-C] [-d] [-dfa] [-i] [-m] [-o osize] [-p] [-t] [source]
-            [destination]
+       pcretest [options] [source] [destination]

 
        pcretest  was written as a test program for the PCRE regular expression
        library itself, but it can also be used for experimenting with  regular
 
        pcretest  was written as a test program for the PCRE regular expression
        library itself, but it can also be used for experimenting with  regular


@@ -25,18 +24,24 @@ SYNOPSIS
 
 OPTIONS
 
 
 OPTIONS
 

+       -b        Behave as if each regex has the /B (show bytecode)  modifier;
+                 the internal form is output after compilation.
+

        -C        Output the version number of the PCRE library, and all avail-
        -C        Output the version number of the PCRE library, and all avail-

-                 able   information  about  the  optional  features  that  are
+                 able  information  about  the  optional  features  that   are

                  included, and then exit.
 
                  included, and then exit.
 

-       -d        Behave as if each regex has  the  /D  (debug)  modifier;  the
-                 internal form is output after compilation.
+       -d        Behave  as  if  each  regex  has the /D (debug) modifier; the
+                 internal form and information about the compiled  pattern  is
+                 output after compilation; -d is equivalent to -b -i.

 
        -dfa      Behave  as if each data line contains the \D escape sequence;
                  this    causes    the    alternative    matching    function,
                  pcre_dfa_exec(),   to   be   used  instead  of  the  standard
                  pcre_exec() function (more detail is given below).
 
 
        -dfa      Behave  as if each data line contains the \D escape sequence;
                  this    causes    the    alternative    matching    function,
                  pcre_dfa_exec(),   to   be   used  instead  of  the  standard
                  pcre_exec() function (more detail is given below).
 

+       -help     Output a brief summary these options and then exit.
+

        -i        Behave as if each regex  has  the  /I  modifier;  information
                  about the compiled pattern is given after compilation.
 
        -i        Behave as if each regex  has  the  /I  modifier;  information
                  about the compiled pattern is given after compilation.
 


@@ -46,20 +51,34 @@ OPTIONS
                  pcretest, -s is a synonym for -m.
 
        -o osize  Set the number of elements in the output vector that is  used
                  pcretest, -s is a synonym for -m.
 
        -o osize  Set the number of elements in the output vector that is  used

-                 when  calling  pcre_exec()  to be osize. The default value is
-                 45, which is enough for 14 capturing subexpressions. The vec-
-                 tor  size  can  be  changed  for individual matching calls by
-                 including \O in the data line (see below).
+                 when  calling pcre_exec() or pcre_dfa_exec() to be osize. The
+                 default value is 45, which is enough for 14 capturing  subex-
+                 pressions   for  pcre_exec()  or  22  different  matches  for
+                 pcre_dfa_exec(). The vector size can be changed for  individ-
+                 ual  matching  calls  by  including  \O in the data line (see
+                 below).

 
        -p        Behave as if each regex has the /P modifier; the POSIX  wrap-
                  per  API  is used to call PCRE. None of the other options has
                  any effect when -p is set.
 
 
        -p        Behave as if each regex has the /P modifier; the POSIX  wrap-
                  per  API  is used to call PCRE. None of the other options has
                  any effect when -p is set.
 

+       -q        Do not output the version number of pcretest at the start  of
+                 execution.
+
+       -S size   On  Unix-like  systems,  set the size of the runtime stack to
+                 size megabytes.
+

        -t        Run each compile, study, and match many times with  a  timer,
                  and  output resulting time per compile or match (in millisec-
                  onds). Do not set -m with -t, because you will then  get  the
                  size  output  a  zillion  times,  and the timing will be dis-
        -t        Run each compile, study, and match many times with  a  timer,
                  and  output resulting time per compile or match (in millisec-
                  onds). Do not set -m with -t, because you will then  get  the
                  size  output  a  zillion  times,  and the timing will be dis-

-                 torted.
+                 torted. You can control the number  of  iterations  that  are
+                 used  for timing by following -t with a number (as a separate
+                 item on the command line). For example, "-t 1000" would iter-
+                 ate 1000 times. The default is to iterate 500000 times.
+
+       -tm       This is like -t except that it times only the matching phase,
+                 not the compile or study phases.

 
 
 DESCRIPTION
 
 
 DESCRIPTION


@@ -76,13 +95,15 @@ DESCRIPTION
        ber of data lines to be matched against the pattern.
 
        Each  data line is matched separately and independently. If you want to
        ber of data lines to be matched against the pattern.
 
        Each  data line is matched separately and independently. If you want to

-       do multiple-line matches, you have to use the \n escape sequence  in  a
-       single  line  of  input  to  encode the newline characters. The maximum
-       length of data line is 30,000 characters.
+       do multi-line matches, you have to use the \n escape sequence (or \r or
+       \r\n, etc., depending on the newline setting) in a single line of input
+       to encode the newline sequences. There is no limit  on  the  length  of
+       data  lines;  the  input  buffer is automatically extended if it is too
+       small.

 
        An empty line signals the end of the data lines, at which point  a  new
        regular  expression is read. The regular expressions are given enclosed
 
        An empty line signals the end of the data lines, at which point  a  new
        regular  expression is read. The regular expressions are given enclosed

-       in any non-alphanumeric delimiters other than backslash, for example
+       in any non-alphanumeric delimiters other than backslash, for example:

 
          /(a|bc)x+yz/
 
 
          /(a|bc)x+yz/
 


@@ -130,38 +151,64 @@ PATTERN MODIFIERS
        The following table shows additional modifiers for setting PCRE options
        that do not correspond to anything in Perl:
 
        The following table shows additional modifiers for setting PCRE options
        that do not correspond to anything in Perl:
 

-         /A    PCRE_ANCHORED
-         /C    PCRE_AUTO_CALLOUT
-         /E    PCRE_DOLLAR_ENDONLY
-         /f    PCRE_FIRSTLINE
-         /N    PCRE_NO_AUTO_CAPTURE
-         /U    PCRE_UNGREEDY
-         /X    PCRE_EXTRA
+         /A          PCRE_ANCHORED
+         /C          PCRE_AUTO_CALLOUT
+         /E          PCRE_DOLLAR_ENDONLY
+         /f          PCRE_FIRSTLINE
+         /J          PCRE_DUPNAMES
+         /N          PCRE_NO_AUTO_CAPTURE
+         /U          PCRE_UNGREEDY
+         /X          PCRE_EXTRA
+         /<cr>       PCRE_NEWLINE_CR
+         /<lf>       PCRE_NEWLINE_LF
+         /<crlf>     PCRE_NEWLINE_CRLF
+         /<anycrlf>  PCRE_NEWLINE_ANYCRLF
+         /<any>      PCRE_NEWLINE_ANY
+
+       Those  specifying  line ending sequencess are literal strings as shown.
+       This example sets multiline matching  with  CRLF  as  the  line  ending
+       sequence:
+
+         /^abc/m<crlf>
+
+       Details  of the meanings of these PCRE options are given in the pcreapi
+       documentation.
+
+   Finding all matches in a string

 
 

-       Searching  for  all  possible matches within each subject string can be
-       requested by the /g or /G modifier. After  finding  a  match,  PCRE  is
+       Searching for all possible matches within each subject  string  can  be
+       requested  by  the  /g  or  /G modifier. After finding a match, PCRE is

        called again to search the remainder of the subject string. The differ-
        ence between /g and /G is that the former uses the startoffset argument
        called again to search the remainder of the subject string. The differ-
        ence between /g and /G is that the former uses the startoffset argument

-       to  pcre_exec()  to  start  searching  at a new point within the entire
-       string (which is in effect what Perl does), whereas the  latter  passes
-       over  a  shortened  substring.  This makes a difference to the matching
+       to pcre_exec() to start searching at a  new  point  within  the  entire
+       string  (which  is in effect what Perl does), whereas the latter passes
+       over a shortened substring. This makes a  difference  to  the  matching

        process if the pattern begins with a lookbehind assertion (including \b
        or \B).
 
        process if the pattern begins with a lookbehind assertion (including \b
        or \B).
 

-       If  any  call  to  pcre_exec()  in a /g or /G sequence matches an empty
-       string, the next call is done with the PCRE_NOTEMPTY and  PCRE_ANCHORED
-       flags  set in order to search for another, non-empty, match at the same
-       point.  If this second match fails, the start  offset  is  advanced  by
-       one,  and  the normal match is retried. This imitates the way Perl han-
+       If any call to pcre_exec() in a /g or  /G  sequence  matches  an  empty
+       string,  the next call is done with the PCRE_NOTEMPTY and PCRE_ANCHORED
+       flags set in order to search for another, non-empty, match at the  same
+       point.   If  this  second  match fails, the start offset is advanced by
+       one, and the normal match is retried. This imitates the way  Perl  han-

        dles such cases when using the /g modifier or the split() function.
 
        dles such cases when using the /g modifier or the split() function.
 

+   Other modifiers
+

        There are yet more modifiers for controlling the way pcretest operates.
 
        There are yet more modifiers for controlling the way pcretest operates.
 

-       The  /+ modifier requests that as well as outputting the substring that
-       matched the entire pattern, pcretest  should  in  addition  output  the
-       remainder  of  the  subject  string. This is useful for tests where the
+       The /+ modifier requests that as well as outputting the substring  that
+       matched  the  entire  pattern,  pcretest  should in addition output the
+       remainder of the subject string. This is useful  for  tests  where  the

        subject contains multiple copies of the same substring.
 
        subject contains multiple copies of the same substring.
 

+       The  /B modifier is a debugging feature. It requests that pcretest out-
+       put a representation of the compiled byte code after compilation.  Nor-
+       mally  this  information contains length and offset values; however, if
+       /Z is also present, this data is replaced by spaces. This is a  special
+       feature for use in the automatic test scripts; it ensures that the same
+       output is generated for different internal link sizes.
+

        The /L modifier must be followed directly by the name of a locale,  for
        example,
 
        The /L modifier must be followed directly by the name of a locale,  for
        example,
 


@@ -180,10 +227,8 @@ PATTERN MODIFIERS
        pattern.  If  the pattern is studied, the results of that are also out-
        put.
 
        pattern.  If  the pattern is studied, the results of that are also out-
        put.
 

-       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. If the pattern was studied, the information returned
-       is also output.
+       The /D modifier is a PCRE debugging feature, and is equivalent to  /BI,
+       that is, both the /B and the /I modifiers.

 
        The /F modifier causes pcretest to flip the byte order of the fields in
        the compiled pattern that  contain  2-byte  and  4-byte  numbers.  This
 
        The /F modifier causes pcretest to flip the byte order of the fields in
        the compiled pattern that  contain  2-byte  and  4-byte  numbers.  This


@@ -225,20 +270,24 @@ DATA LINES
        nary"  regular  expressions,  you probably don't need any of these. The
        following escapes are recognized:
 
        nary"  regular  expressions,  you probably don't need any of these. The
        following escapes are recognized:
 

-         \a         alarm (= BEL)
-         \b         backspace
-         \e         escape
-         \f         formfeed
-         \n         newline
-         \r         carriage return
-         \t         tab
-         \v         vertical tab
+         \a         alarm (BEL, \x07)
+         \b         backspace (\x08)
+         \e         escape (\x27)
+         \f         formfeed (\x0c)
+         \n         newline (\x0a)
+         \qdd       set the PCRE_MATCH_LIMIT limit to dd
+                      (any number of digits)
+         \r         carriage return (\x0d)
+         \t         tab (\x09)
+         \v         vertical tab (\x0b)

          \nnn       octal character (up to 3 octal digits)
          \xhh       hexadecimal character (up to 2 hex digits)
          \x{hh...}  hexadecimal character, any number of digits
                       in UTF-8 mode
          \A         pass the PCRE_ANCHORED option to pcre_exec()
          \nnn       octal character (up to 3 octal digits)
          \xhh       hexadecimal character (up to 2 hex digits)
          \x{hh...}  hexadecimal character, any number of digits
                       in UTF-8 mode
          \A         pass the PCRE_ANCHORED option to pcre_exec()

+                      or pcre_dfa_exec()

          \B         pass the PCRE_NOTBOL option to pcre_exec()
          \B         pass the PCRE_NOTBOL option to pcre_exec()

+                      or pcre_dfa_exec()

          \Cdd       call pcre_copy_substring() for substring dd
                       after a successful match (number less than 32)
          \Cname     call pcre_copy_named_substring() for substring
          \Cdd       call pcre_copy_substring() for substring dd
                       after a successful match (number less than 32)
          \Cname     call pcre_copy_named_substring() for substring


@@ -262,19 +311,39 @@ DATA LINES
                       ated by next non-alphanumeric character)
          \L         call pcre_get_substringlist() after a
                       successful match
                       ated by next non-alphanumeric character)
          \L         call pcre_get_substringlist() after a
                       successful match

-         \M         discover the minimum MATCH_LIMIT setting
+         \M         discover the minimum MATCH_LIMIT and
+                      MATCH_LIMIT_RECURSION settings

          \N         pass the PCRE_NOTEMPTY option to pcre_exec()
          \N         pass the PCRE_NOTEMPTY option to pcre_exec()

+                      or pcre_dfa_exec()

          \Odd       set the size of the output vector passed to
                       pcre_exec() to dd (any number of digits)
          \P         pass the PCRE_PARTIAL option to pcre_exec()
                       or pcre_dfa_exec()
          \Odd       set the size of the output vector passed to
                       pcre_exec() to dd (any number of digits)
          \P         pass the PCRE_PARTIAL option to pcre_exec()
                       or pcre_dfa_exec()

+         \Qdd       set the PCRE_MATCH_LIMIT_RECURSION limit to dd
+                      (any number of digits)

          \R         pass the PCRE_DFA_RESTART option to pcre_dfa_exec()
          \S         output details of memory get/free calls during matching
          \Z         pass the PCRE_NOTEOL option to pcre_exec()
          \R         pass the PCRE_DFA_RESTART option to pcre_dfa_exec()
          \S         output details of memory get/free calls during matching
          \Z         pass the PCRE_NOTEOL option to pcre_exec()

+                      or pcre_dfa_exec()

          \?         pass the PCRE_NO_UTF8_CHECK option to
          \?         pass the PCRE_NO_UTF8_CHECK option to

-                      pcre_exec()
+                      pcre_exec() or pcre_dfa_exec()

          \>dd       start the match at offset dd (any number of digits);
                       this sets the startoffset argument for pcre_exec()
          \>dd       start the match at offset dd (any number of digits);
                       this sets the startoffset argument for pcre_exec()

+                      or pcre_dfa_exec()
+         \<cr>      pass the PCRE_NEWLINE_CR option to pcre_exec()
+                      or pcre_dfa_exec()
+         \<lf>      pass the PCRE_NEWLINE_LF option to pcre_exec()
+                      or pcre_dfa_exec()
+         \<crlf>    pass the PCRE_NEWLINE_CRLF option to pcre_exec()
+                      or pcre_dfa_exec()
+         \<anycrlf> pass the PCRE_NEWLINE_ANYCRLF option to pcre_exec()
+                      or pcre_dfa_exec()
+         \<any>     pass the PCRE_NEWLINE_ANY option to pcre_exec()
+                      or pcre_dfa_exec()
+
+       The escapes that specify line ending  sequences  are  literal  strings,
+       exactly as shown. No more than one newline setting should be present in
+       any data line.

 
        A backslash followed by anything else just escapes the  anything  else.
        If  the very last character is a backslash, it is ignored. This gives a
 
        A backslash followed by anything else just escapes the  anything  else.
        If  the very last character is a backslash, it is ignored. This gives a


@@ -282,21 +351,25 @@ DATA LINES
        nates the data input.
 
        If  \M  is present, pcretest calls pcre_exec() several times, with dif-
        nates the data input.
 
        If  \M  is present, pcretest calls pcre_exec() several times, with dif-

-       ferent values in the match_limit field of the  pcre_extra  data  struc-
-       ture,  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  patterns
-       with  very large numbers of matching possibilities, it can become large
-       very quickly with increasing length of subject string.
-
-       When \O is used, the value specified may be higher or  lower  than  the
+       ferent values in the match_limit and  match_limit_recursion  fields  of
+       the  pcre_extra  data structure, until it finds the minimum numbers for
+       each parameter that allow pcre_exec() to complete. The match_limit num-
+       ber  is  a  measure of the amount of backtracking that takes place, and
+       checking it out can be instructive. For most simple matches, the number
+       is  quite  small,  but for patterns with very large numbers of matching
+       possibilities, it can become large very quickly with increasing  length
+       of subject string. The match_limit_recursion number is a measure of how
+       much stack (or, if PCRE is compiled with  NO_RECURSE,  how  much  heap)
+       memory is needed to complete the match attempt.
+
+       When  \O  is  used, the value specified may be higher or lower than the

        size set by the -O command line option (or defaulted to 45); \O applies
        only to the call of pcre_exec() for the line in which it appears.
 
        size set by the -O command line option (or defaulted to 45); \O applies
        only to the call of pcre_exec() for the line in which it appears.
 

-       If the /P modifier was present on the pattern, causing the POSIX  wrap-
-       per  API to be used, only \B and \Z have any effect, causing REG_NOTBOL
-       and REG_NOTEOL to be passed to regexec() respectively.
+       If  the /P modifier was present on the pattern, causing the POSIX wrap-
+       per API to be used, the only option-setting  sequences  that  have  any
+       effect  are \B and \Z, causing REG_NOTBOL and REG_NOTEOL, respectively,
+       to be passed to regexec().

 
        The use of \x{hh...} to represent UTF-8 characters is not dependent  on
        the  use  of  the  /8 modifier on the pattern. It is recognized always.
 
        The use of \x{hh...} to represent UTF-8 characters is not dependent  on
        the  use  of  the  /8 modifier on the pattern. It is recognized always.


@@ -332,7 +405,7 @@ DEFAULT OUTPUT FROM PCRETEST
        is an example of an interactive pcretest run.
 
          $ pcretest
        is an example of an interactive pcretest run.
 
          $ pcretest

-         PCRE version 5.00 07-Sep-2004
+         PCRE version 7.0 30-Nov-2006

 
            re> /^abc(\d+)/
          data> abc123
 
            re> /^abc(\d+)/
          data> abc123


@@ -343,16 +416,17 @@ DEFAULT OUTPUT FROM PCRETEST
 
        If the strings contain any non-printing characters, they are output  as
        \0x  escapes,  or  as \x{...} escapes if the /8 modifier was present on
 
        If the strings contain any non-printing characters, they are output  as
        \0x  escapes,  or  as \x{...} escapes if the /8 modifier was present on

-       the pattern. If the pattern has the /+ modifier, the  output  for  sub-
-       string  0 is followed by the the rest of the subject string, identified
-       by "0+" like this:
+       the pattern. See below for the definition of  non-printing  characters.
+       If  the pattern has the /+ modifier, the output for substring 0 is fol-
+       lowed by the the rest of the subject string, identified  by  "0+"  like
+       this:

 
            re> /cat/+
          data> cataract
           0: cat
           0+ aract
 
 
            re> /cat/+
          data> cataract
           0: cat
           0+ aract
 

-       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

        matching attempts are output in sequence, like this:
 
            re> /\Bi(\w\w)/g
        matching attempts are output in sequence, like this:
 
            re> /\Bi(\w\w)/g


@@ -366,16 +440,17 @@ DEFAULT OUTPUT FROM PCRETEST
 
        "No match" is output only if the first match attempt fails.
 
 
        "No match" is output only if the first match attempt fails.
 

-       If  any  of the sequences \C, \G, or \L are present in a data line that
-       is successfully matched, the substrings extracted  by  the  convenience
+       If any of the sequences \C, \G, or \L are present in a data  line  that
+       is  successfully  matched,  the substrings extracted by the convenience

        functions are output with C, G, or L after the string number instead of
        a colon. This is in addition to the normal full list. The string length
        functions are output with C, G, or L after the string number instead of
        a colon. This is in addition to the normal full list. The string length

-       (that  is,  the return from the extraction function) is given in paren-
+       (that is, the return from the extraction function) is given  in  paren-

        theses after each string for \C and \G.
 
        theses after each string for \C and \G.
 

-       Note that while patterns can be continued over several lines  (a  plain
+       Note that whereas patterns can be continued over several lines (a plain

        ">" prompt is used for continuations), data lines may not. However new-
        ">" prompt is used for continuations), data lines may not. However new-

-       lines can be included in data by means of the \n escape.
+       lines  can  be included in data by means of the \n escape (or \r, \r\n,
+       etc., depending on the newline sequence setting).

 
 
 OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
 
 
 OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION


@@ -394,8 +469,8 @@ OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
        (Using  the  normal  matching function on this data finds only "tang".)
        The longest matching string is always given first (and numbered  zero).
 
        (Using  the  normal  matching function on this data finds only "tang".)
        The longest matching string is always given first (and numbered  zero).
 

-       If  /gP  is  present  on  the  pattern,  the search for further matches
-       resumes at the end of the longest match. For example:
+       If /g is present on the pattern, the search for further matches resumes
+       at the end of the longest match. For example:

 
            re> /(tang|tangerine|tan)/g
          data> yellow tangerine and tangy sultana\D
 
            re> /(tang|tangerine|tan)/g
          data> yellow tangerine and tangy sultana\D


@@ -418,7 +493,7 @@ RESTARTING AFTER A PARTIAL MATCH
        can restart the match with additional subject data by means of  the  \R
        escape sequence. For example:
 
        can restart the match with additional subject data by means of  the  \R
        escape sequence. For example:
 

-           re> /^?(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)$/
+           re> /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/

          data> 23ja\P\D
          Partial match: 23ja
          data> n05\R\D
          data> 23ja\P\D
          Partial match: 23ja
          data> n05\R\D


@@ -468,6 +543,18 @@ CALLOUTS
        the pcrecallout documentation.
 
 
        the pcrecallout documentation.
 
 

+NON-PRINTING CHARACTERS
+
+       When  pcretest is outputting text in the compiled version of a pattern,
+       bytes other than 32-126 are always treated as  non-printing  characters
+       are are therefore shown as hex escapes.
+
+       When  pcretest  is  outputting text that is a matched part of a subject
+       string, it behaves in the same way, unless a different locale has  been
+       set  for  the  pattern  (using  the  /L  modifier).  In  this case, the
+       isprint() function to distinguish printing and non-printing characters.
+
+

 SAVING AND RELOADING COMPILED PATTERNS
 
        The  facilities  described  in  this section are not available when the
 SAVING AND RELOADING COMPILED PATTERNS
 
        The  facilities  described  in  this section are not available when the


@@ -524,11 +611,20 @@ SAVING AND RELOADING COMPILED PATTERNS
        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.
 
 

+SEE ALSO
+
+       pcre(3), pcreapi(3), pcrecallout(3),  pcrematching(3),  pcrepartial(d),
+       pcrepattern(3), pcreprecompile(3).
+
+

 AUTHOR
 
        Philip Hazel
 AUTHOR
 
        Philip Hazel

-       University Computing Service,
-       Cambridge CB2 3QG, England.
+       University Computing Service
+       Cambridge CB2 3QH, England.
+
+
+REVISION

 
 

-Last updated: 28 February 2005
-Copyright (c) 1997-2005 University of Cambridge.
+       Last updated: 24 April 2007
+       Copyright (c) 1997-2007 University of Cambridge.