It could be just like a named regex match list, as in $regml(). A limit of 10 items, and perhaps only local ones (personal opinion from one who thinks $ifmatch should be local - global ones would be fine as well, resembling $regml() even more). Doesn't sound confusing to me. The only thing I'd really worry about is speed.. and maybe this could be just another identifier, leaving $ifmatch as it is.
