I've never seen it documented, but what would it mean if they were interpolated as back references?

By which I mean, if the back reference in question captured two or more characters, would that mean required the character class to match any one of those characters?

I think that the problem would be that character classes are compiled before the regex begins to run. Ie. before the capture has taken place.

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In reply to Re: \1, \2, \3, ... inside of a character class by BrowserUk
in thread \1, \2, \3, ... inside of a character class by ccn

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