ERR21             922 ext/pcre/pcrelib/pcre_compile.c if (newspace == NULL) return ERR21;
ERR21            7099 ext/pcre/pcrelib/pcre_compile.c                 *errorcodeptr = ERR21;
ERR21            9220 ext/pcre/pcrelib/pcre_compile.c   errorcode = ERR21;