REG_EESCAPE        50 ext/mbstring/oniguruma/onigposix.h #define REG_EESCAPE          5
REG_EESCAPE        79 ext/pcre/pcrelib/pcreposix.h REG_EESCAPE,     /* bad escape sequence */
REG_EESCAPE        48 regex/regex.h  #define	REG_EESCAPE	 5