Crash to Desktop with string.find()

[pjt15253]

Is anyone else experiencing a crash to desktop with certain calls to string.find? I'm having trouble pinning down the exact conditions that cause it, but one test call I made that caused it (using /zgoo) was string.find("this string has aaa in it", "[aàáâäAAÀÁÂÄ][aàáâäAAÀÁÂÄ][aàáâäAAÀÁÂÄ]"). I know it has a duplicate capital A in the character classes, but still shouldn't cause a CTD.