It probably finds nothing because there is a \n at the end of each line you read from a text file. Adding chomp(@idstring); or chomp $string; will take care of that
Also if $string has regex special characters in it, the result will be quite different from what you expect. Use \Q and \E to escape the special characters
I would suggest using foreach instead of while. Looks much cleaner that way and you don't need a $count variable:
foreach $string (@idstring) {
chomp($string);
if ($msg =~ m/.*\Q$string\E.*/i) {
print "$string found";
last;
}
}
Update: Removed reference to $count in my loop, thanks to ssandv for spotting it
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