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When the pattern given to String#partition and String#rpartition contain a /\K/ (lookbehind) operator, the methods return strings sliced at incorrect positions. ``` # without patch "abcdbce".partition(/b\Kc/) # => ["a", "c", "cdbce"] "abcdbce".rpartition(/b\Kc/) # => ["abcd", "c", "ce"] ``` This patch fixes the problem by using BEG(0) instead of the return value of rb_reg_search. ``` # with patch "abcdbce".partition(/b\Kc/) # => ["ab", "c", "dbce"] "abcdbce".rpartition(/b\Kc/) # => ["abcdb", "c", "e"] ``` As a side-effect this patch makes String#partition 2x faster when the pattern is a costly Regexp by performing Regexp search only once, which was unexpectedly done twice in the original implementation. Fixes [Bug #17119]