rb_memsearch      184 include/ruby/encoding.h long rb_memsearch(const void*,long,const void*,long,rb_encoding*);
rb_memsearch     2311 string.c       	pos = rb_memsearch(sptr, slen, s, len, enc);
rb_memsearch     5380 string.c       	       (end = rb_memsearch(sptr, slen, ptr, eptr - ptr, enc)) >= 0) {