Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

Re: Bizarreness in ?PATTERN? and g

by integral (Hermit)
on Jun 04, 2004 at 15:37 UTC ( #360948=note: print w/replies, xml ) Need Help??

in reply to Bizarreness in ?PATTERN? and g

As has already been said a match in scalar context with /g doesn't 'reset' pos() so that the next match with /g on that variable will start from that position.

The key error in your understanding is that "they're two completely separate regexen". They're not because they're connected by pos() since they have /g.

In first examples using ?? work just the same as the latter case with m// with the once-only nature of ?? just being an additional constraint. ?? works exactly like m// with regards to setting pos() and starting from pos() in scalar context with /g.

So the key point is that the position of the last match is being carried over between the statements, which you weren't expecting.

integral, resident of freenode's #perl

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://360948]
[karlgoethebier]: Rap rhymes to crap. Ouch!
[karlgoethebier]: Unne hip unne hop unne schoppe inne kopp...
[1nickt]: kgb not quite as simple as ... and ...; are interchangeable. There are edge cases, shown in perlsyn.

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (8)
As of 2017-11-18 19:38 GMT
Find Nodes?
    Voting Booth?
    In order to be able to say "I know Perl", you must have:

    Results (277 votes). Check out past polls.