You asked to match "xx", not "XX". Regexen (like most good programmers) are rather picky about clearly and correctly specifying what you want matched. Maybe you only wanted to match lower case letters. Maybe you wanted to match only upper case. Maybe you didn't care. The interpretation that it wouldn't match was perfectly valid given the inherent ambiguity in your original question.

I'd point you (yet again) at How (Not) To Ask A Question, but it's obvious you're not going to take the time to either read it nor take the care to make useful questions.

*plonk*

The cake is a lie.
The cake is a lie.
The cake is a lie.


In reply to Re^3: count repeatation by Fletch
in thread count repeatation by saranperl

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.