SYN_POSIX_COMMON_OP   50 regsyntax.c      ( SYN_POSIX_COMMON_OP | ONIG_SYN_OP_ESC_LPAREN_SUBEXP |
SYN_POSIX_COMMON_OP   67 regsyntax.c      ( SYN_POSIX_COMMON_OP | ONIG_SYN_OP_LPAREN_SUBEXP |