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

Re^2: Reguar expression

by citromatik (Curate)
on Jun 22, 2009 at 10:45 UTC ( #773566=note: print w/replies, xml ) Need Help??

in reply to Re: Reguar expression
in thread Reguar expression

That's not very complicated:

Well, maybe, but you are not asking the OP. That is: "I need a regular expression to match the following pattern.". You are using 2. (and perliff above uses 3!).

Update: Solving the problem with 2+ regexps is more or less trivial, but using just 1 is far more interesting. Here is a solution using look-ahead assertions (see perlre):

my $re = qr{ ^ # match at the beginning. (?! # Look-ahead assertion: Fail if the next matc +hes .* first # match "first" everywhere except at the begi +nning of the string ) # end of look-ahead assertion This .* \. # Match "This" (at the beginning), followed b +y anything and a dot $ # Match the end of a string. }x; # Allow these comments


Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://773566]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (4)
As of 2017-02-22 05:08 GMT
Find Nodes?
    Voting Booth?
    Before electricity was invented, what was the Electric Eel called?

    Results (324 votes). Check out past polls.