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You're thinking too hard. I cheated. My patch just fools the regex engine into thinking it hasn't actually started matching yet. Here's a drawn-out example.
$str = "abc.def.ghi.jkl"; $str =~ s{ .* # match as much as you can \K # and then pretend HERE is where we start \. .* # then a . and anything else }{}x; # replace with nothing __END__ abc.def.ghi.jkl $& AAAAAAAAAAA .* "abc.def.ghi" \K "" B \. "." BCCC .* ".jkl"
Does that help you see what I do? My patch consists of a couple lines of support, but this is the beef:
case KEEP: PL_regstartp[0] = locinput - PL_bostr; break;
That's what happens when the regex engine encounters the \K. The rest of the patch is just creating the "KEEP" node, and telling toke.c that "\K" is a valid escape sequence.

Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: Re: New regex trick... by japhy
in thread New regex trick... by japhy

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