Oh! of course! I was returning "(.){$len}", which is $len number of single character capture groups. What I actually wanted was "(.{$len})" - a single capture of length $len.

I also see you added the missing /s modifier, which explains why it was stopping mid way through.

That makes the (??{...}) issue much clearer. Thanks!

In reply to Re^2: Modifying pos() from within (?{...}) by mxb
in thread Modifying pos() from within (?{...}) by mxb

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