CHAR_9            583 ext/pcre/pcrelib/pcre_compile.c #define IS_DIGIT(x) ((x) >= CHAR_0 && (x) <= CHAR_9)
CHAR_9           1210 ext/pcre/pcrelib/pcre_compile.c     case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
CHAR_9           7402 ext/pcre/pcrelib/pcre_compile.c         case CHAR_5: case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9: