Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Re: regex question/mystery

by Tanktalus (Canon)
on Jan 17, 2006 at 18:41 UTC ( #523800=note: print w/replies, xml ) Need Help??


in reply to regex question/mystery

While it's generally handy if you show some example input, in this case your question is "why is $2 set?" which doesn't need sample input. The answer is because it's the second parenthesised value in the regexp. Perl's REs never compress the list of found values in case knowing which one is which is important. In this case, a simplification will get you what you want:

if (/^(?:ifSpeed.|1.3.6.1.2.1.2.2.1.5.)(\d+)/){
This way, there is only one set of capturing parens. The first set of parens has the ?: modifier which says "this is for grouping only, not for capturing."

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://523800]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (5)
As of 2020-06-01 00:10 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    If programming languages were movie genres, Perl would be:















    Results (177 votes). Check out past polls.

    Notices?