Regexp::Common returns regexp objects, so one can drop the outer // and it will compile.

print "P2 has path\n" if ($P2 =~ $RE{delimited}{ -delim => '/' } );
print "P2 has path\n" if ($P2 =~ $RE{delimited}{ -delim => '\/' } );

[download]

Then the escaping becomes a consideration.

use 5.026;
use Regexp::Common qw[ delimited ];

say '\/';
say $RE{delimited}{ -delim => '\/' };
say '\\/';
say $RE{delimited}{ -delim => '\\/' };
say '\\\/';
say $RE{delimited}{ -delim => '\\\/' };
say '\\\\/';
say $RE{delimited}{ -delim => '\\\\/' };

[download]

produces

\/
(?:(?|(?:\\)(?:[^\\]*(?:(?:\\\\)[^\\]*)*)(?:\\)|(?:\/)(?:[^\\\/]*(?:\\
+.[^\\\/]*)*)(?:\/)))
\/
(?:(?|(?:\\)(?:[^\\]*(?:(?:\\\\)[^\\]*)*)(?:\\)|(?:\/)(?:[^\\\/]*(?:\\
+.[^\\\/]*)*)(?:\/)))
\\/
(?:(?|(?:\\)(?:[^\\]*(?:(?:\\\\)[^\\]*)*)(?:\\)|(?:\\)(?:[^\\]*(?:(?:\
+\\\)[^\\]*)*)(?:\\)|(?:\/)(?:[^\\\/]*(?:\\.[^\\\/]*)*)(?:\/)))
\\/
(?:(?|(?:\\)(?:[^\\]*(?:(?:\\\\)[^\\]*)*)(?:\\)|(?:\\)(?:[^\\]*(?:(?:\
+\\\)[^\\]*)*)(?:\\)|(?:\/)(?:[^\\\/]*(?:\\.[^\\\/]*)*)(?:\/)))

[download]

It also appears that Regexp::Common does not de-duplicate the character sequence before it builds the regexp, as the regexps become more complicated as the sequences increase in length.

In reply to Re^5: Delimiters in Regexp::Common (updated) by swl
in thread Delimiters in Regexp::Common by rongrw

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.