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

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Sat Oct 3 16:48:17 2009 UTC (11 years, 11 months ago) by ph10
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Documentation update.
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 /+ (as
7 used by pcretest), which is recognized and handled by the program.
9 The data lines are processed as Perl double-quoted strings, so if they contain
10 " $ or @ characters, these have to be escaped. For this reason, all such
11 characters in testinput1, testinput4, testinput6, and testinput11 are escaped
12 so that they can be used for perltest as well as for pcretest. The special
13 upper case pattern modifiers such as /A that pcretest recognizes, and its
14 special data line escapes, are not used in these files. The output should be
15 identical, apart from the initial identifying banner.
17 The perltest.pl script can also test UTF-8 features. It recognizes the special
18 modifier /8 that pcretest uses to invoke UTF-8 functionality. The testinput4
19 and testinput6 files can be fed to perltest to run compatible UTF-8 tests.
20 However, it is necessary to add "use utf8;" to the script to make this work
21 correctly.
23 The testinput11 file contains tests that use features of Perl 5.10, so does not
24 work with Perl 5.8.
26 The other testinput files are not suitable for feeding to perltest.pl, since
27 they make use of the special upper case modifiers and escapes that pcretest
28 uses to test some features of PCRE. Some of these files also contains malformed
29 regular expressions, in order to check that PCRE diagnoses them correctly.
31 Philip Hazel
32 October 2009


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