/[pcre]/code/tags/pcre-6.3/README
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revision 37 by nigel, Sat Feb 24 21:39:09 2007 UTC revision 39 by nigel, Sat Feb 24 21:39:13 2007 UTC
# Line 70  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 on a Unix system, first edit Makefile for your system. It is a  To build PCRE on a Unix system, first edit Makefile for your system. It is a
77  fairly simple make file, and there are some comments near the top, after the  fairly simple make file, and there are some comments near the top, after the
# Line 86  and on Macintoshes, but I don't know the Line 88  and on Macintoshes, but I don't know the
88  It should be straightforward to build PCRE on any system that has a Standard C  It should be straightforward to build PCRE on any system that has a Standard C
89  compiler.  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  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  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  below) on each of the testinput files in turn, and compares the output with the
# Line 220  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.
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