amk wrote: > outside a character class it's a character if there are exactly > 3 octal digits; otherwise it's a backref. So \41 is a backref > to group 41, but \041 is the literal character ASCII 33. so what's the right way to parse this? read up to three digits, check if they're a valid octal number, and treat them as a decimal group number if not? </F>
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