Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

Re^2: Using Look-ahead and Look-behind

by Roy Johnson (Monsignor)
on Nov 12, 2007 at 17:54 UTC ( #650323=note: print w/replies, xml ) Need Help??


in reply to Re: Using Look-ahead and Look-behind
in thread Using Look-ahead and Look-behind

Generally, the decision about using ?: is not about whether it's necessary, but that capturing whatever you're grouping isn't necessary. The ?: modifier makes parentheses not capture, which is somewhat more efficient and might make the task of counting left parentheses less onerous.

By the way, it's not a lookaround feature.


Caution: Contents may have been coded under pressure.