I'm still not convinced that nesting qr// snippets into larger qr// parts is such a show stopper.

Are they stored as nested objects causing overhead? (Hmm probably... I read something in the docs about them acting like closures.)

But what if I stringify/flatten the outcome and recompile it, even with a /o once modifier? This should reset most effects.

Unless context switches like different nested modifiers like /i cause new overhead...(?)

  DB<1> p qr/[0-9a-f]/i
(?^ui:[0-9a-f])
  DB<2> $x=qr/[0-9a-f]/i

  DB<3> $hex_range= qr/$x+ - $x+/x

  DB<4> say $hex_range
(?^ux:(?^ui:[0-9a-f])+ - (?^ui:[0-9a-f])+)

  DB<5>

[download]

I'll put this on my to-do list, and will try to dive deeper next weekend.

Like running benchmarks and looking into the op-tree.

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In reply to Re^7: Reusing a complex regexp in multiple spots, escaping the regexp by LanX
in thread Reusing a complex regexp in multiple spots, escaping the regexp by ecm

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.