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43 lines
1.8 KiB
Plaintext
43 lines
1.8 KiB
Plaintext
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The perltest program
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--------------------
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The perltest.pl script tests Perl's regular expressions; it has the same
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specification as pcretest, and so can be given identical input, except that
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input patterns can be followed only by Perl's lower case modifiers and certain
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other pcretest modifiers that are either handled or ignored:
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/+ recognized and handled by perltest
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/++ the second + is ignored
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/8 recognized and handled by perltest
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/J ignored
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/K ignored
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/W ignored
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/S ignored
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/SS ignored
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/Y ignored
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The pcretest \Y escape in data lines is removed before matching. The data lines
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are processed as Perl double-quoted strings, so if they contain " $ or @
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characters, these have to be escaped. For this reason, all such characters in
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the Perl-compatible testinput1 file are escaped so that they can be used for
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perltest as well as for pcretest. The special upper case pattern modifiers such
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as /A that pcretest recognizes, and its special data line escapes, are not used
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in the Perl-compatible test file. The output should be identical, apart from
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the initial identifying banner.
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The perltest.pl script can also test UTF-8 features. It recognizes the special
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modifier /8 that pcretest uses to invoke UTF-8 functionality. The testinput4
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and testinput6 files can be fed to perltest to run compatible UTF-8 tests.
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However, it is necessary to add "use utf8; require Encode" to the script to
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make this work correctly. I have not managed to find a way to handle this
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automatically.
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The other testinput files are not suitable for feeding to perltest.pl, since
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they make use of the special upper case modifiers and escapes that pcretest
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uses to test certain features of PCRE. Some of these files also contain
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malformed regular expressions, in order to check that PCRE diagnoses them
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correctly.
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Philip Hazel
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January 2012
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