[Liverpool] shell script (sh) : variable contains string?

[Dave Love]

Ben Arnold <iamseawolf at gmail.com> writes:

> I set the variable as a list of resolutions fine, I just can't find a clean way 
> of seeing if (1024x768x[8|16|24]) exists in the pre-defined variable.

[...]

> NB -- It's an sh script, not bash. If it were bash, I could do
> [variable =~ text]

If the question is how to do pattern matching in portable sh, the
traditional way is like:

  case ... in
    *1024x768x24*) ... ;;
    ...
  esac

and POSIX expr(1) has regexp matching.  However, if you're using awk
anyway, why not just match with that?