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    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; require Encode" to the script to
   32 make this work correctly. I have not managed to find a way to handle this
   33 automatically.
   35 The other testinput files are not suitable for feeding to perltest.pl, since
   36 they make use of the special upper case modifiers and escapes that pcretest
   37 uses to test certain features of PCRE. Some of these files also contain
   38 malformed regular expressions, in order to check that PCRE diagnoses them
   39 correctly.
   41 Philip Hazel
   42 January 2012