#! perl
use strict;
use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(shift)->explain;

##</code><code>##

tilly@localhost:~$ perl re-explain foo    
The regular expression:

(?-imsx:foo)

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  foo                      'foo'
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
tilly@localhost:~$ perl re-explain '(foo|bar)'
The regular expression:

(?-imsx:(foo|bar))

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    foo                      'foo'
----------------------------------------------------------------------
   |                        OR
----------------------------------------------------------------------
    bar                      'bar'
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------