The doc you linked to (perlre) has tons of references to \K. :-) You, like me, must be still at perl5.8, and we don't have it in our docs. But if you are in 5.10, then read again :-)
[]s, HTH, Massa (κς,πμ,πλ)

In reply to Re^3: positive look behind regexp mystery (\K assertion) by massa
in thread positive look behind regexp mystery by rovf

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