string.c(rb_str_split_m): Handle /\K/ correctly #3407
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Use BEG(0) instead of the result of rb_reg_search to handle the cases when the separator Regexp contains /\K/ (lookbehind) operator. Fixes [Bug #17113]
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Fixes https://bugs.ruby-lang.org/issues/17113
Use BEG(0) instead of the result of rb_reg_search to handle the cases when the separator Regexp contains /\K/ (lookbehind) operator.