Well I wish you would have mentioned that to begin with, it's much easier.
To allow text as ".5"
To force the full dollar amount "$0.5":
$regex($1-,/\x24\d+\.[5-9]/S)
The problem is that it also has to allow $1.0, etc. I figured out a dirty way to do it, which sucks, but works:
IF ((*0.0* iswm $1-) || (*0.1* iswm $1-) || (*0.2* iswm $1-) || (*0.3* iswm $1-) || (*0.4* iswm $1-)) {
don't do urgent stuff
}
ELSE {
do urgent stuff
}
}
And that's working for now.
Thanks for your help!