use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new( '/^v[0-9][0-9]\.[0-9][0-9]-[a-z][0-9]
+[0-9][0-9]/' )->explain;
__END__
The regular expression:
(?-imsx:/^v[0-9][0-9]\.[0-9][0-9]-[a-z][0-9][0-9][0-9]/)
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):
----------------------------------------------------------------------
/ '/'
----------------------------------------------------------------------
^ the beginning of the string
----------------------------------------------------------------------
v 'v'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
\. '.'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
- '-'
----------------------------------------------------------------------
[a-z] any character of: 'a' to 'z'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
/ '/'
----------------------------------------------------------------------
) end of grouping
----------------------------------------------------------------------
