I didn't even know you could call a subroutine from inside a regex.

The replace expression of the substitution operator is treated as Perl code rather than a string literal when the e modifier is used.

Ref: perlop

Just to be certain, the value for the match of /(\d+.\d+)/ is $1 and is then carried into sub convert as the value $_ ?

No. A subroutine's arguments are found in @_ (no relation to $_). $_[0] (again, no relation to $_) is the first element of @_, so it's the first argument of the subroutine.

Ref: perlsub

In reply to Re^3: Crafting a regex for a split() function... by ikegami
in thread Crafting a regex for a split() function... by chinamox

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.