Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Howdy :)

This is just something that came up in a casual email exchange today. And I've no particular reason for posing the question here other than curiosity, and perhaps providing the opportunity for those with plenty of regex fu to show their stuff :)

"How would you construct a regex to match an integer between 0 and 100?"

My regex fu is only average at best, but after a couple of minutes I came up with:

perl -le 'for (qw/0 1 19 32.4 100 77 138 342.1/) { print "$_ is ", /^( +?:100|\d\d?)$/ ? "valid input" : "invalid input"}'
Which gives:
0 is valid input 1 is valid input 19 is valid input 32.4 is invalid input 100 is valid input 77 is valid input 138 is invalid input 342.1 is invalid input

Solves the "problem", but hard-coding the 100 in the pattern is pretty horrible, I think.

So how would others do this?


In reply to Matching an integer between 0 and 100 by McDarren

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
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (9)
    As of 2017-12-14 10:56 GMT
    Find Nodes?
      Voting Booth?
      What programming language do you hate the most?

      Results (389 votes). Check out past polls.