> Actually it was not a problem at all in what I wanted to do: e.g.,
> "String"[?"(?#1)(?s)(?<=^.{3})."]
> ^ wasn't even needed.

That's a call to replace, right?
In that case, there's no issue with lookbehinds (with or without ^) 
because the plugin is executing a single regex operation.

Lookbehinds aren't safe with replaceg and matchg though.
Sometimes it will give you the expected result and sometimes not... what 
happens is that (as you guessed) the string is truncated after each 
match and, if the stuff you were testing for was consumed by the 
previous match, you'd get the wrong result.



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