Hi Fellow Monks,
Good Day.
A few minutes back while coding I faced the below problem.
I was trying to match all the string till it matches two consecutive new line character. Usually I use negative look ahead format for matching such kind of string. But today I was not able to match the string and I got the below error message since I used 'warnings'.
May I know the reason why I am getting the error, can't I use newline characters for these kind of matching?
The below code and data is sample for testing, not real code and data.
use strict;
use warnings;
my $s = do {local $/, <DATA>};
$s =~ s/\w+\s+\w+\s*\d+\s*\,(?:(?!(?:\n\n).)*)\n\n/'test'/egsi; #getti
+ng error
#$s =~ s/\w+\s+\w+\s*\d+\s*\,.*?\n\n/'test'/egsi; #working fine
print $s;
output:
-------
(?!(?:\n\n).)* matches null string many times in regex; marked by <--
+HERE in m/
\w+\s+\w+\s*\d+\s*,(?:(?!(?:\n\n).)* <-- HERE )\n\n/ at pract.pl line
+6.
LMTRILOG db 5 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
+, 0 , 0 ,
0;
db 25 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
+ , 0 , 0 ,
0;
__DATA__
LMTRILOG db 5 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
+, 0 , 0 , 0;
db 25 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
+ , 0 , 0 , 0;
updated: added __DATA__