Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
The good thing about Perl regex is that you don't have to write the entire regex in one go, you can build it part by part programmatically. I often construct my regex in the maner as shown below to improve readability (at least to myself) and maintainability:
use strict; use warnings; # allowed prompt characters my $prompt_regex = '[>$%@~# ]'; # allowed characters in the prompt my $allowed_regex = '[\w@\-\.]*'; # a list of allowed prompt patterns my @patterns = ( '\[?' . $allowed_regex . $prompt_regex . '\]?', quotemeta '\\[\\e[0m\\] [0m', ); # build my regex dynamically my $regex = '(' . join('|',@patterns) .')\s?'; # test the regex print "regex: /$regex/\n\n"; while (<DATA>) { chomp; /$regex/ && printf "%-30smatched: %s\n", $_, $1; } __DATA__ blah crap crap [roger@www#] blah blah foo [] crap crap \[\e[0m\] [0m foo bar

And the output -
regex: /(\[?[\w@\-\.]*[>$%@~# ]\]?|\\\[\\e\[0m\\\]\ \[0m)\s?/ blah matched: crap crap matched: [roger@www#] blah blah foo matched: [roger@www#] [] crap crap matched: [] \[\e[0m\] [0m foo bar matched: \[\e[0m\] [0m

In reply to Re: regex logical equivalence? by Roger
in thread regex logical equivalence? by Anonymous Monk

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    Domain Nodelet?
    and the web crawler heard nothing...

    How do I use this?Last hourOther CB clients
    Other Users?
    Others browsing the Monastery: (4)
    As of 2024-07-14 23:52 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found

      erzuuli‥ 🛈The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.