[McUsr]

I use groups, (look forward, and lookbehind) all the time, now that I have been comfortable with them, they are great in that I can write simpler regexps, or use fewer patterns. And I use perl for one liners, which is as far as I can go comfortably with perl. Thing is, I use regexps most for one-liners, and with perl, and grouping, it is simpler for me, than using sed for instance, where I then would have to think, (and test), substantially more, or filter the output through yet anoter sed expression. So grouping works for me. :) It is of course slower, but so far, the most critical time for me, has been the speed with which I can make a solution that works.