s/will load/will not load/, right?

The .* is saying there can be any number of characters in the string between the first match (the character class) and the backreference (\1) match, from zero (two characters next to each other) on up...

Say out first match was 'a', then 'a' is also referred to in \1. Then we have a.*a: aa,  a.a,  a..a,  a...a,  a....a, etc. And its a negative lookahead, so if any one of those combinations matches, the regex will fail.

--
Allolex

In reply to Re: Re: Re: Re: Regex (lookahead) Confusion by allolex
in thread Regex (lookahead) Confusion by ChrisR

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.