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Contents of /code/trunk/doc/perltest.txt

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Revision 868 - (show annotations)
Fri Jan 13 17:16:32 2012 UTC (7 years, 8 months ago) by ph10
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The last of the 16-bit documentation major updates.
1 The perltest program
2 --------------------
4 The perltest.pl script tests Perl's regular expressions; it has the same
5 specification as pcretest, and so can be given identical input, except that
6 input patterns can be followed only by Perl's lower case modifiers and certain
7 other pcretest modifiers that are either handled or ignored:
9 /+ recognized and handled by perltest
10 /++ the second + is ignored
11 /8 recognized and handled by perltest
12 /J ignored
13 /K ignored
14 /W ignored
15 /S ignored
16 /SS ignored
17 /Y ignored
19 The pcretest \Y escape in data lines is removed before matching. The data lines
20 are processed as Perl double-quoted strings, so if they contain " $ or @
21 characters, these have to be escaped. For this reason, all such characters in
22 the Perl-compatible testinput1 file are escaped so that they can be used for
23 perltest as well as for pcretest. The special upper case pattern modifiers such
24 as /A that pcretest recognizes, and its special data line escapes, are not used
25 in the Perl-compatible test file. The output should be identical, apart from
26 the initial identifying banner.
28 The perltest.pl script can also test UTF-8 features. It recognizes the special
29 modifier /8 that pcretest uses to invoke UTF-8 functionality. The testinput4
30 and testinput6 files can be fed to perltest to run compatible UTF-8 tests.
31 However, it is necessary to add "use utf8;" to the script to make this work
32 correctly.
34 The other testinput files are not suitable for feeding to perltest.pl, since
35 they make use of the special upper case modifiers and escapes that pcretest
36 uses to test some features of PCRE. Some of these files also contains malformed
37 regular expressions, in order to check that PCRE diagnoses them correctly.
39 Philip Hazel
40 January 2012


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