/[pcre]/code/tags/pcre-3.1/README
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revision 35 by nigel, Sat Feb 24 21:39:05 2007 UTC revision 39 by nigel, Sat Feb 24 21:39:13 2007 UTC
# Line 37  The distribution should contain the foll Line 37  The distribution should contain the foll
37    
38    ChangeLog         log of changes to the code    ChangeLog         log of changes to the code
39    LICENCE           conditions for the use of PCRE    LICENCE           conditions for the use of PCRE
40    Makefile          for building PCRE    Makefile          for building PCRE in Unix systems
41    README            this file    README            this file
42    RunTest           a shell script for running tests    RunTest           a Unix shell script for running tests
43    Tech.Notes        notes on the encoding    Tech.Notes        notes on the encoding
44    pcre.3            man page for the functions    pcre.3            man page source for the functions
45    pcreposix.3       man page for the POSIX wrapper API    pcre.3.txt        plain text version
46      pcre.3.html       HTML version
47      pcreposix.3       man page source for the POSIX wrapper API
48      pcreposix.3.txt   plain text version
49      pcreposix.3.HTML  HTML version
50    dftables.c        auxiliary program for building chartables.c    dftables.c        auxiliary program for building chartables.c
51    get.c             )    get.c             )
52    maketables.c      )    maketables.c      )
# Line 53  The distribution should contain the foll Line 57  The distribution should contain the foll
57    pcreposix.h       header for the external POSIX wrapper API    pcreposix.h       header for the external POSIX wrapper API
58    internal.h        header for internal use    internal.h        header for internal use
59    pcretest.c        test program    pcretest.c        test program
60    pgrep.1           man page for pgrep    pgrep.1           man page source for pgrep
61      pgrep.1.txt       plain text version
62      pgrep.1.HTML      HTML version
63    pgrep.c           source of a grep utility that uses PCRE    pgrep.c           source of a grep utility that uses PCRE
64    perltest          Perl test program    perltest          Perl test program
65    testinput1        test data, compatible with Perl 5.004 and 5.005    testinput1        test data, compatible with Perl 5.004 and 5.005
# Line 64  The distribution should contain the foll Line 70  The distribution should contain the foll
70    testoutput2       test results corresponding to testinput2    testoutput2       test results corresponding to testinput2
71    testoutput3       test results corresponding to testinput3    testoutput3       test results corresponding to testinput3
72    testoutput4       test results corresponding to testinput4    testoutput4       test results corresponding to testinput4
73      dll.mk            for Win32 DLL
74      pcre.def          ditto
75    
76  To build PCRE, edit Makefile for your system (it is a fairly simple make file,  To build PCRE on a Unix system, first edit Makefile for your system. It is a
77  and there are some comments at the top) and then run it. It builds two  fairly simple make file, and there are some comments near the top, after the
78  libraries called libpcre.a and libpcreposix.a, a test program called pcretest,  text "On a Unix system". Then run "make". It builds two libraries called
79  and the pgrep command.  libpcre.a and libpcreposix.a, a test program called pcretest, and the pgrep
80    command. You can use "make install" to copy these, and the public header file
81  To test PCRE, run the RunTest script in the pcre directory. This runs pcretest  pcre.h, to appropriate live directories on your system. These installation
82  on each of the testinput files in turn, and compares the output with the  directories are defined at the top of the Makefile, and you should edit them if
83    necessary.
84    
85    For a non-Unix system, read the comments at the top of Makefile, which give
86    some hints on what needs to be done. PCRE has been compiled on Windows systems
87    and on Macintoshes, but I don't know the details as I don't use those systems.
88    It should be straightforward to build PCRE on any system that has a Standard C
89    compiler.
90    
91    Some help in building a Win32 DLL of PCRE in GnuWin32 environments was
92    contributed by Paul.Sokolovsky@technologist.com. These environments are
93    Mingw32 (http://www.xraylith.wisc.edu/~khan/software/gnu-win32/) and
94    CygWin  (http://sourceware.cygnus.com/cygwin/). Paul comments:
95    
96      For CygWin, set CFLAGS=-mno-cygwin, and do 'make dll'. You'll get
97      pcre.dll (containing pcreposix also), libpcre.dll.a, and dynamically
98      linked pgrep and pcretest. If you have /bin/sh, run RunTest (three
99      main test go ok, locale not supported).
100    
101    To test PCRE, run the RunTest script in the pcre directory. This can also be
102    run by "make runtest". It runs the pcretest test program (which is documented
103    below) on each of the testinput files in turn, and compares the output with the
104  contents of the corresponding testoutput file. A file called testtry is used to  contents of the corresponding testoutput file. A file called testtry is used to
105  hold the output from pcretest (which is documented below).  hold the output from pcretest. To run pcretest on just one of the test files,
106    give its number as an argument to RunTest, for example:
 To run pcretest on just one of the test files, give its number as an argument  
 to RunTest, for example:  
107    
108    RunTest 3    RunTest 3
109    
110  The first and third test files can also be fed directly into the perltest  The first and third test files can also be fed directly into the perltest
111  program to check that Perl gives the same results. The third file requires the  script to check that Perl gives the same results. The third file requires the
112  additional features of release 5.005, which is why it is kept separate from the  additional features of release 5.005, which is why it is kept separate from the
113  main test input, which needs only Perl 5.004. In the long run, when 5.005 is  main test input, which needs only Perl 5.004. In the long run, when 5.005 is
114  widespread, these two test files may get amalgamated.  widespread, these two test files may get amalgamated.
# Line 103  output to say why. If running this test Line 130  output to say why. If running this test
130  in the comparison output, it means that locale is not available on your system,  in the comparison output, it means that locale is not available on your system,
131  despite being listed by "locale". This does not mean that PCRE is broken.  despite being listed by "locale". This does not mean that PCRE is broken.
132    
 To install PCRE, copy libpcre.a to any suitable library directory (e.g.  
 /usr/local/lib), pcre.h to any suitable include directory (e.g.  
 /usr/local/include), and pcre.3 to any suitable man directory (e.g.  
 /usr/local/man/man3).  
   
 To install the pgrep command, copy it to any suitable binary directory, (e.g.  
 /usr/local/bin) and pgrep.1 to any suitable man directory (e.g.  
 /usr/local/man/man1).  
   
133  PCRE has its own native API, but a set of "wrapper" functions that are based on  PCRE has its own native API, but a set of "wrapper" functions that are based on
134  the POSIX API are also supplied in the library libpcreposix.a. Note that this  the POSIX API are also supplied in the library libpcreposix.a. Note that this
135  just provides a POSIX calling interface to PCRE: the regular expressions  just provides a POSIX calling interface to PCRE: the regular expressions
# Line 214  others which set PCRE options that do no Line 232  others which set PCRE options that do no
232  /E, and /X set PCRE_ANCHORED, PCRE_DOLLAR_ENDONLY, and PCRE_EXTRA respectively.  /E, and /X set PCRE_ANCHORED, PCRE_DOLLAR_ENDONLY, and PCRE_EXTRA respectively.
233    
234  Searching for all possible matches within each subject string can be requested  Searching for all possible matches within each subject string can be requested
235  by the /g or /G modifier. The /g modifier behaves similarly to the way it does  by the /g or /G modifier. After finding a match, PCRE is called again to search
236  in Perl. After finding a match, PCRE is called again to search the remainder of  the remainder of the subject string. The difference between /g and /G is that
237  the subject string. The difference between /g and /G is that the former uses  the former uses the startoffset argument to pcre_exec() to start searching at
238  the start_offset argument to pcre_exec() to start searching at a new point  a new point within the entire string (which is in effect what Perl does),
239  within the entire string, whereas the latter passes over a shortened substring.  whereas the latter passes over a shortened substring. This makes a difference
240  This makes a difference to the matching process if the pattern begins with a  to the matching process if the pattern begins with a lookbehind assertion
241  lookbehind assertion (including \b or \B).  (including \b or \B).
242    
243    If any call to pcre_exec() in a /g or /G sequence matches an empty string, the
244    next call is done with the PCRE_NOTEMPTY flag set so that it cannot match an
245    empty string again. This imitates the way Perl handles such cases when using
246    the /g modifier or the split() function.
247    
248  There are a number of other modifiers for controlling the way pcretest  There are a number of other modifiers for controlling the way pcretest
249  operates.  operates.
# Line 253  compilation. Line 276  compilation.
276  The /S modifier causes pcre_study() to be called after the expression has been  The /S modifier causes pcre_study() to be called after the expression has been
277  compiled, and the results used when the expression is matched.  compiled, and the results used when the expression is matched.
278    
279  The /M modifier causes information about the size of memory block used to hold  The /M modifier causes the size of memory block used to hold the compiled
280  the compile pattern to be output.  pattern to be output.
281    
282  Finally, the /P modifier causes pcretest to call PCRE via the POSIX wrapper API  Finally, the /P modifier causes pcretest to call PCRE via the POSIX wrapper API
283  rather than its native API. When this is done, all other modifiers except /i,  rather than its native API. When this is done, all other modifiers except /i,
# Line 283  is removed, and it is then scanned for \ Line 306  is removed, and it is then scanned for \
306    \Gdd   call pcre_get_substring() for substring dd after a successful match    \Gdd   call pcre_get_substring() for substring dd after a successful match
307             (any decimal number less than 32)             (any decimal number less than 32)
308    \L     call pcre_get_substringlist() after a successful match    \L     call pcre_get_substringlist() after a successful match
309      \N     pass the PCRE_NOTEMPTY option to pcre_exec()
310    \Odd   set the size of the output vector passed to pcre_exec() to dd    \Odd   set the size of the output vector passed to pcre_exec() to dd
311             (any number of decimal digits)             (any number of decimal digits)
312    \Z     pass the PCRE_NOTEOL option to pcre_exec()    \Z     pass the PCRE_NOTEOL option to pcre_exec()
# Line 375  specification as pcretest, and so can be Line 399  specification as pcretest, and so can be
399  input patterns can be followed only by Perl's lower case modifiers. The  input patterns can be followed only by Perl's lower case modifiers. The
400  contents of testinput1 and testinput3 meet this condition.  contents of testinput1 and testinput3 meet this condition.
401    
402  The data lines are processed as Perl strings, so if they contain $ or @  The data lines are processed as Perl double-quoted strings, so if they contain
403  characters, these have to be escaped. For this reason, all such characters in  " \ $ or @ characters, these have to be escaped. For this reason, all such
404  testinput1 and testinput3 are escaped so that they can be used for perltest as  characters in testinput1 and testinput3 are escaped so that they can be used
405  well as for pcretest, and the special upper case modifiers such as /A that  for perltest as well as for pcretest, and the special upper case modifiers such
406  pcretest recognizes are not used in these files. The output should be  as /A that pcretest recognizes are not used in these files. The output should
407  identical, apart from the initial identifying banner.  be identical, apart from the initial identifying banner.
408    
409  The testinput2 and testinput4 files are not suitable for feeding to perltest,  The testinput2 and testinput4 files are not suitable for feeding to perltest,
410  since they do make use of the special upper case modifiers and escapes that  since they do make use of the special upper case modifiers and escapes that
# Line 389  contains malformed regular expressions, Line 413  contains malformed regular expressions,
413  them correctly.  them correctly.
414    
415  Philip Hazel <ph10@cam.ac.uk>  Philip Hazel <ph10@cam.ac.uk>
416  June 1999  July 1999
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