Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

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.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://967108]
help
Chatterbox?
[stevieb]: I'm working on hiding the fact the software needs MetaCPAN::Client, as I often have a hell of a time installing it. I'm going to change it to let the user know if they do revdep that it needs to be installed, and remove that distribution ..
[stevieb]: ...from being a prereq

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (4)
As of 2017-06-25 23:38 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    How many monitors do you use while coding?















    Results (572 votes). Check out past polls.