Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris

Re: weird regex question

by kennethk (Abbot)
on Apr 25, 2012 at 16:17 UTC ( #967108=note: print w/ replies, xml ) Need Help??

in reply to weird regex question

You can get an explanation of any regular expression using YAPE::Regex::Explain. In this case, it outputs:

The regular expression: (?-imsx:^.{!}(.{5})) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- . any character except \n ---------------------------------------------------------------------- {!} '{!}' ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- .{5} any character except \n (5 times) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- ) end of grouping ----------------------------------------------------------------------

The issue is that the $! variable is interpolated to an empty string but ! operator doesn't get interpolated as such in the regular expression. Essentially, your modification is actually looking for the string literal {!}.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

Comment on Re: weird regex question
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://967108]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (6)
As of 2015-11-28 12:23 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (741 votes), past polls