|Perl Monk, Perl Meditation
m//g in list contextby grain_of_sand (Initiate)
|on Aug 08, 2002 at 21:24 UTC
grain_of_sand has asked for the wisdom of the Perl Monks concerning the following question:
I am trying to debug my understanding of the matching operator. When invoked with the g modifier in list context, I thought that the return value is a list of all possible matches. If capturing parentheses are used, then the list is the set of all $1, $2, etc captured.
The following bit of Perl:
I understand the first line of output, but it seems to me that the second line of output should really be:
This is because the (\w):(\w) can match a:b and also b:c. It appears that the regex engine finds the first match of a:b and then starts the next matching attempt after the b, in which case it cannot find the b:c match. I expected the next matching attempt to start after the a, so that the b:c match would also be found.
I have read the Camel book chapter on this & the perlop man page, but they don't really have a lot to say about this...