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Re: Regular Expression mystery

by PodMaster (Abbot)
on Sep 20, 2002 at 11:15 UTC ( [id://199440]=note: print w/replies, xml ) Need Help??


in reply to Regular Expression mystery

Don't ever guess again.
use YAPE::Regex::Explain; die YAPE::Regex::Explain->new(qr/.*${name}-*/)->explain; __END__ The regular expression: (?-imsx:.*-*) 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): ---------------------------------------------------------------------- .* any character except \n (0 or more times (matching the most amount possible)) ---------------------------------------------------------------------- -* '-' (0 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of grouping ----------------------------------------------------------------------
update:
In case you were wondering where the (?-imsx:.*-*) comes from, well perl -e"print qr/asdf/", perl -e"print ref qr/a/" and since ${name} is not defined anywhere in the above snippet, that part don't show up in the explanation. Here's an alternative
use YAPE::Regex::Explain; my $name = 'asdf'; die YAPE::Regex::Explain->new(qr/.*${name}-*/)->explain; __END__ The regular expression: (?-imsx:.*asdf-*) 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): ---------------------------------------------------------------------- .* any character except \n (0 or more times (matching the most amount possible)) ---------------------------------------------------------------------- asdf 'asdf' ---------------------------------------------------------------------- -* '-' (0 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of grouping ----------------------------------------------------------------------

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Re: Re: Regular Expression mystery
by Anonymous Monk on Sep 20, 2002 at 12:06 UTC
    I got alot of answers here. Thanks so much to all of you!

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