That rocks. The lookahead and keeping matches techniques are essentials.

nice used the output of the modulo operator for the 1 and 0. Very slick.

Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems.

in js Boolean(" ") return TRUE and Boolean(undefined) return FALSE, if the condition throw a false condition the string will be a space string.

\d for digits! Thank you

Would fail on "\n"

good!

Thanks so much! I did the most inefficient solution and had no idea this existed. I was reading all about 'regex' but still was coming up dry.

I noticed that the description only applies when the string length is odd, otherwise it should be completely trimmed.

shortest one yet
bravo!

Same problem here.