Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

Comment on

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

try to find all wildcards plus leading and following characters

/(.)x(.)/

so every real match must be of a form preceeded by 1..$1 and $2..6 in this special case.

Since you have arbitrary characters w/o real order you will need to precompile a look-up hash to find the patterns needed for $1 and $2.

e.g. 12a34a56 would lead to $pre{a}=qx/12a(34a)?/ and $post{a}=qx/(a34)?a56/ or better $post{a}=qx/(a34|a34a56)/!

the check of the hashes can be done in a while loop against $PREMATCH and $POSTMATCH or in embeded perlcode with something like (?{..})

No guaranties, I'm typing mobile and can't test ATM.

But this should be quite efficient, even for cases where x is a wildcard for more than 2 characters.

Cheers Rolf

( addicted to the Perl Programming Language)


In reply to Re: "Inverse" Pattern Matching by LanX
in thread "Inverse" Pattern Matching by hdb

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

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

    How do I use this? | Other CB clients
    Other Users?
    Others making s'mores by the fire in the courtyard of the Monastery: (10)
    As of 2014-07-10 22:01 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      When choosing user names for websites, I prefer to use:








      Results (217 votes), past polls