onigenc_step_back  229 include/ruby/oniguruma.h         onigenc_step_back((enc),(start),(s),(end),(n))
onigenc_step_back  293 include/ruby/oniguruma.h OnigUChar* onigenc_step_back P_((OnigEncoding enc, const OnigUChar* start, const OnigUChar* s, const OnigUChar* end, int n));