Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine

Re: Negative Lookahead Assertion Problem

by Enlil (Parson)
on Jul 18, 2005 at 23:40 UTC ( #475924=note: print w/replies, xml ) Need Help??

in reply to Negative Lookahead Assertion Problem

Since your question as to why it doesn't work has been answered. (Basically it will backtrack till it does, and by moving a character back satisfies the regex.)

This should work:/\w+::(?>\w+)(?!\s*\()/

#!/usr/bin/perl use strict; use warnings; my @strings = ( '1. Foo::Bar', '2. Foo::Bar(', '3. Foo::Bar (', '4. Foo::Bar ' ); for ( @strings ) { print $_,$/ if /\w+::(?>\w+)(?!\s*\()/; } __END__ 1. Foo::Bar 4. Foo::Bar
Have a look at perlre where it reads about (?>pattern)


Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://475924]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (6)
As of 2016-10-22 09:48 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (294 votes). Check out past polls.