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05.08.2008 at 01:55PM PDT, ID: 23387665
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Regex split question

Hi, say I have the following text:
"TOKEN1::STILLTOKEN1:TOKEN2:TOKEN"

and i want to split it as
TOKEN1::STILLTOKEN1
TOKEN2
TOKEN3

so it will recogize : as a delimiter, but not :: ?  I keep playing around with it, but can't seem to figure it out.  
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Question Stats
Zone: Programming
Question Asked By: PurpleSlade
Solution Provided By: Adam314
Participating Experts: 1
Solution Grade: A
Views: 0
Translate:
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05.08.2008 at 02:26PM PDT, ID: 21528625

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05.08.2008 at 02:38PM PDT, ID: 21528702

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05.08.2008 at 03:38PM PDT, ID: 21529047

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05.08.2008 at 03:47PM PDT, ID: 21529097

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05.08.2008 at 02:26PM PDT, ID: 21528625

Rank: Genius

1:
my @f = split(/(?<=[^:]):(?=[^:])/, $str);
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Accepted Solution
 
05.08.2008 at 02:38PM PDT, ID: 21528702
Is  <= used in this context?

Binary "<='' returns true if the left argument is numerically less than or equal to the right argument.
 
05.08.2008 at 03:38PM PDT, ID: 21529047

Rank: Genius

See here for details:
http://perldoc.perl.org/perlretut.html#Looking-ahead-and-looking-behind

The (?<=RE) means look-behind, which is a non-capture search (it doesn't use up any characters like a \b) looking backward.  The RE can be any fixed-width regular expression

The (?=RE) means look-ahead, which is a non-capture search looking forward.  The RE can be any regular expression.


So overall, the regular expression matches: a colon, where the previous character is not a colon (but is not included in the match), and where the next character is not a colon (but is not included in the match)
 
05.08.2008 at 03:47PM PDT, ID: 21529097
Thanks for the extra explanation!
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628