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 ----------------------------------------------------------------------

____________________________________________________
** The Third rule of perl club is a statement of fact: pod is sexy.


In reply to Re: Regular Expression mystery by PodMaster
in thread Regular Expression mystery by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.