This is a toy project to get a better understanding of how regular expression engines work. REE can build parse trees and compile working NFA representations of (simple) regular expressions. This can be accessed via a simple public interface.
use feature 'say';
use REE;
# matching
my $ree = REE->new(regex => '(foo|bar)*baz');
my $string = "foobarbaz";
say "$string matches" if $ree->match($string);
# meta information
say 'canonical regex: ' . $ree->canonical_regex;
say 'NFA representation: ';
say $ree->nfa_representation;There is a simple web interface for REE.
Copyright 2016 Mirko Westermeier.
This program is distributed under the MIT (X11) License
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.