If you never change the expression (the repl_ref hash) you can start by adding the o modifier to the regexp:

s/($repl_str)/$$repl_ref{$1}/go;

That's the easiest and you might want to stop there if you're happy with the result.

If you want to speed it up more then you will have to work on the left part of the pattern. Is there any way you can match the repl_str stuff without a huge |? A character class maybe if you are looking for characters outside of the 0-127 range, or maybe an escape character and then an odd character? A mixture of the two? It depends on your data.

In reply to Re: Faster search and replace? by mirod
in thread Faster search and replace? by snax

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.