OP_CREF          1100 ext/pcre/pcrelib/pcre_compile.c     case OP_CREF:
OP_CREF          1188 ext/pcre/pcrelib/pcre_compile.c     case OP_CREF:
OP_CREF          4216 ext/pcre/pcrelib/pcre_compile.c         code[1+LINK_SIZE] = OP_CREF;
OP_CREF           770 ext/pcre/pcrelib/pcre_exec.c     else if (ecode[LINK_SIZE+1] == OP_CREF)    /* Group used test */