The \K says to keep all to its left.

The  \K regex operator acutally functions to ignore everything to its left WRT the final match and only include or 'keep' text to its right. See discussion of  "(?<=pattern)" "\K" in the Look-Around Assertions section of perlre.

In reply to Re^2: Help combining two regex's into one by AnomalousMonk
in thread Help combining two regex's into one by Anonymous Monk

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