NAME¶
Regexp::Optimizer - optimizes regular expressions
VERSION¶
$Id: Optimizer.pm,v 0.23 2013/02/26 05:47:41 dankogai Exp dankogai $
SYNOPSIS¶
use Regexp::Optimizer;
my $o = Regexp::Optimizer->new->optimize(qr/foobar|fooxar|foozap/);
# $re is now qr/foo(?:[bx]ar|zap)/
EXPORT¶
none.
SUBROUTINES/METHODS¶
new¶
Makes a new optimizer instance.
my $ro = Regexp::Optimizer->new;
optimize¶
Does the optimization.
my $re = qr/foobar|fooxar|foozap/;
$re = $ro->optimize($re);
If it is already optimized -- no alteration in the regexp, it is practically an
identity function which simply returns an argument.
If not, it dissasembles the regexp, feeds it to Regexp::Assemble, and
reassembles the result.
as_string¶
Same as "optimize()" but returns a string instead of regexp object.
CAVEAT¶
??{CODE} used¶
This module depends on the "??{CODE}" regexp construct which is still
considered experimental as of Perl 5.16.
not idempotent¶
If you feed the regexp that is already optimized, the resulting regexp may not
necessarily the same -- usually you get duplicate "(?:)":
my $re = qr/foobar|fooxar|foozap/;
$re = $ro->optimize($re); # qr/foo(?:[bx]ar|zap)/
$re = $ro->optimize($re); # qr/foo(?:(?:[bx]ar|zap))/
SEE ALSO¶
Regexp::Assemble, perlre
AUTHOR¶
Dan Kogai, "<dankogai+cpan at gmail.com>"
BUGS¶
Please report any bugs or feature requests to "bug-regexp-optimizer at
rt.cpan.org", or through the web interface at
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Regexp-Optimizer
<
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Regexp-Optimizer>. I
will be notified, and then you'll automatically be notified of progress on
your bug as I make changes.
SUPPORT¶
You can find documentation for this module with the perldoc command.
perldoc Regexp::Optimizer
You can also look for information at:
- •
- RT: CPAN's request tracker (report bugs here)
http://rt.cpan.org/NoAuth/Bugs.html?Dist=Regexp-Optimizer
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Regexp-Optimizer>
- •
- AnnoCPAN: Annotated CPAN documentation
http://annocpan.org/dist/Regexp-Optimizer
<http://annocpan.org/dist/Regexp-Optimizer>
- •
- CPAN Ratings
http://cpanratings.perl.org/d/Regexp-Optimizer
<http://cpanratings.perl.org/d/Regexp-Optimizer>
- •
- Search CPAN
http://search.cpan.org/dist/Regexp-Optimizer/
<http://search.cpan.org/dist/Regexp-Optimizer/>
ACKNOWLEDGEMENTS¶
LICENSE AND COPYRIGHT¶
Copyright 2013 Dan Kogai.
This program is free software; you can redistribute it and/or modify it under
the terms of the the Artistic License (2.0). You may obtain a copy of the full
license at:
<
http://www.perlfoundation.org/artistic_license_2_0>
Any use, modification, and distribution of the Standard or Modified Versions is
governed by this Artistic License. By using, modifying or distributing the
Package, you accept this license. Do not use, modify, or distribute the
Package, if you do not accept this license.
If your Modified Version has been derived from a Modified Version made by
someone other than you, you are nevertheless required to ensure that your
Modified Version complies with the requirements of this license.
This license does not grant you the right to use any trademark, service mark,
tradename, or logo of the Copyright Holder.
This license includes the non-exclusive, worldwide, free-of-charge patent
license to make, have made, use, offer to sell, sell, import and otherwise
transfer the Package with respect to any patent claims licensable by the
Copyright Holder that are necessarily infringed by the Package. If you
institute patent litigation (including a cross-claim or counterclaim) against
any party alleging that the Package constitutes direct or contributory patent
infringement, then this Artistic License to you shall terminate on the date
that such litigation is filed.
Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND
CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
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