use strict;
use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr'lo/gw|')->explain();

__OUTPUT__

The regular expression:

(?-imsx:lo/gw|)

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):
----------------------------------------------------------------------
  lo/gw                    'lo/gw'
----------------------------------------------------------------------
 |                        OR
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------