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I have this line in bash:
echo "a=-1"|perl -nle 'if (/.*=[0-9]*/){print;}'
and get:
a=-1
Wait..I didn’t say perl should match on the -. I made a minor change to:
echo "a=-1"|perl -nle 'if (/.*=[0-9]*$/){print;}'
and it correctly ignores the line. Why?
[0-9]* can match the empty string. When you anchored to the end of the string, you prevented this empty match.
You probably want to say [0-9]+ to mean “at least one digit”.