perlquestion morgon Hi<p> in scripts I usually match like this: <c> my ($match) = $string =~ /$regex/; </c> but sometimes I do one-liners like this: <c> perl -ne '/$regex/, $SUM += $1; END { print $SUM }' file.txt </c> In this context I was just bitten by the (documented) behaviour that a failed match does not reset the match variables which in my case lead to a wrong sum as on empty lines where the regex did not match the previous match was (again) added to the sum.<p> For curiosity's sake now:<p> Assuming I did not want to introduce new variables but use $1 etc: How would I reset these variables to avoid the wrong sum as both "undef $1" as "$1=undef" does not work?