[jQuery] regex in selector

[jeremyBass]

How do you put regex in a selector.....

been try things like this
$('.Round_gen'+ (/$[1-9][0-9]?/) +'').each(function() {. . .etc
to target classes named

.Round_gen0
.Round_gen99

really any number after .Round_gen

thanks for the help
jeremyBass