You can use (??{ }) to create the second half of the regex after parsing the left half:
use v5.20;
while (<DATA>)
{
chomp;
say "$_ => '$1' x '$2'" if /x(.*)x((??{ ".{".length($1)."}" }))x/;
}
__DATA__
xaxxax
xxx
x.x.x
x12x..x
x123x...x
x123x.x.x
xxx => '' x ''
x.x.x => '.' x '.'
x12x..x => '12' x '..'
x123x...x => '123' x '...'
x123x.x.x => '123' x '.x.'
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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