ONIG_SYN_OP2_ESC_K_NAMED_BACKREF   45 regparse.c           ONIG_SYN_OP2_QMARK_LT_NAMED_GROUP | ONIG_SYN_OP2_ESC_K_NAMED_BACKREF |
ONIG_SYN_OP2_ESC_K_NAMED_BACKREF 3455 regparse.c           if (IS_SYNTAX_OP2(syn, ONIG_SYN_OP2_ESC_K_NAMED_BACKREF)) {
ONIG_SYN_OP2_ESC_K_NAMED_BACKREF  203 regsyntax.c          ONIG_SYN_OP2_ESC_K_NAMED_BACKREF        |