6356     char_u	*tail;  in do_string_sub()  local
6375 	tail = str;  in do_string_sub()
6377 	while (vim_regexec_nl(&regmatch, str, (colnr_T)(tail - str)))  in do_string_sub()
6385 		    i = mb_ptr2len(tail);  in do_string_sub()
6386 		    mch_memmove((char_u *)ga.ga_data + ga.ga_len, tail,  in do_string_sub()
6389 		    tail += i;  in do_string_sub()
6402 	    sublen = vim_regsub(&regmatch, sub, expr, tail, FALSE, TRUE, FALSE);  in do_string_sub()
6403 	    if (ga_grow(&ga, (int)((end - tail) + sublen -  in do_string_sub()
6411 	    i = (int)(regmatch.startp[0] - tail);  in do_string_sub()
6412 	    mch_memmove((char_u *)ga.ga_data + ga.ga_len, tail, (size_t)i);  in do_string_sub()
6417 	    tail = regmatch.endp[0];  in do_string_sub()
6418 	    if (*tail == NUL)  in do_string_sub()
6425 	    STRCPY((char *)ga.ga_data + ga.ga_len, tail);  in do_string_sub()