CODEWITHSUNDEEP
regexperl
Sam Weisenthal
Sam Weisenthal

Reputation: 2951

Reference to nonexistent group in regex

This code opens a log file (csv) and takes some data from it. For example, here's a line from that file: 

m/557,181, f2,20140

Here's the code:

open(LOG, '<',"$data_file") or die "can't open LOG $!\n";

while (my $line = <LOG>) {
print "$line\n";
($re,$sure,$ker,$ste) = split ($line, ',');

}

close LOG;

When I run it, I get: 

Reference to nonexistent group in regex; marked by <-- HERE in m/557,181, f\2<-- HERE,20140

Not sure what's going on.

Upvotes: 0

Views: 1102

Answers (2)

Guntram Blohm
Guntram Blohm

Reputation: 9819

split(',', $line)

not

split($line, ',').

Upvotes: 5

mpapec
mpapec

Reputation: 50637

($re,$sure,$ker,$ste) = split (',', $line);

which is really 

($re,$sure,$ker,$ste) = split (/,/, $line);

as split separator is always regex (' ' is special case)

Upvotes: 4

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