If you plan on using Perl for more than a day or two I strongly recommend you read through the regular expression documentation provided with Perl (see perlretut, perlre and perlreref). Perl is strong on text processing and a large chunk of that comes from using regular expressions so understanding Perl's regular expression is important to writing good Perl code.

For this particular match you could make it more or less fussy (like mathing the () part or not). A somewhat non-fussy match would be /H=[^[]* \[ ([^\]]+) \]/x. Note the use of the x flag to allow white space in the expression so it's easier to see the various moving parts.

True laziness is hard work

In reply to Re^3: Process mail logs by GrandFather
in thread Process mail logs by stevbutt

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.