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

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Revision 691 - (show annotations) (download)
Sun Sep 11 14:31:21 2011 UTC (3 years ago) by ph10
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Final source and document tidies for 8.20-RC1.

1 The perltest program
2 --------------------
3
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:
8
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
18 The data lines are processed as Perl double-quoted strings, so if they contain
19 " $ or @ characters, these have to be escaped. For this reason, all such
20 characters in testinput1, testinput4, testinput6, and testinput11 are escaped
21 so that they can be used for perltest as well as for pcretest. The pcretest \Y
22 escape in data lines is removed.
23
24 The special upper case pattern modifiers such as /A that pcretest recognizes,
25 and its special data line escapes, are not used in these files. The output
26 should be identical, apart from the initial identifying banner.
27
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.
33
34 The testinput11 file contains tests that use features of Perl 5.10, so does not
35 work with Perl 5.8.
36
37 The other testinput files are not suitable for feeding to perltest.pl, since
38 they make use of the special upper case modifiers and escapes that pcretest
39 uses to test some features of PCRE. Some of these files also contains malformed
40 regular expressions, in order to check that PCRE diagnoses them correctly.
41
42 Philip Hazel
43 August 2011

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