REG_ECOLLATE       48 ext/mbstring/oniguruma/onigposix.h #define REG_ECOLLATE         3
REG_ECOLLATE       77 ext/pcre/pcrelib/pcreposix.h REG_ECOLLATE,    /* collation error - not relevant */
REG_ECOLLATE       46 regex/regex.h  #define	REG_ECOLLATE	 3