I routinely use g, s, and sometimes even i, e, x, c.
I even know what o and m means, but I haven't find any use for them.
However, I am all confused when I write regexen in ruby, because the m option for ruby regexps is the same as the s in perl.
Even worse, if you write s by habit, you don't even get a warning because it has a different meaning.
Update 2007 jan 22: since then, I've found a use for m as well.
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