regex help needed

I am looking for: ab1 in line1
and looking for: ab2 in line 2

actually ab1 and ab2 immediately follow the last "/" (there are
numerous "/" on the line (w/o quotes))

These are not working. can some explain what these say and what they
should say (syntax) to return the results I'm looking for: if ab1/ab2
are in the line, return true.

/^[^\#]*ab1/,@lines

/^[^\#]*ab2/,@lines

Thanks

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