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perl split

Posted on 2013-01-07
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Last Modified: 2013-01-07
split (/\t+/, $line);  # this code split on tabs (\t), but what does the + after the \t do?
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Question by:rgbcof
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2 Comments
 
LVL 31

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farzanj earned 250 total points
ID: 38753627
+ means one or more tabs.  So more than one tabs together will also be treated like one tab.
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LVL 84

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by:ozo
ozo earned 250 total points
ID: 38753631
see
perldoc perlre
or
perl -mYAPE::Regex::Explain -e "print YAPE::Regex::Explain->new(qr/\t+/)->explain"
The regular expression:

(?-imsx:\t+)

matches as follows:
 
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  \t+                      '\t' (tab) (1 or more times (matching the
                           most amount possible))
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
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