Regex escaping in job specification

[troycomi]

Working through some error reporting issues and I realized we don't escape any regex characters in the job specification. For example, a job specification like cmd.super would have the . match any character or find -name '*.out' | grep help would have issues possibly with the * and the | as they would be interpreted as regex characters.

I'm debating leaving that as a feature (something like \d+ could be useful) but probably safer to escape in the JobSpec initialization.