[OfekEfron]

Код:

stock strreplace(string[], const search[], const replacement[], bool:ignorecase = false, pos = 0, limit = -1, maxlength = sizeof(string)) {
    if (limit == 0) return 0;
    new sublen = strlen(search), replen = strlen(replacement), bool:packed = ispacked(string), maxlen = maxlength, len = strlen(string), count = 0;

    if (packed) maxlen *= 4;
    if (!sublen) return 0;
	while (-1 != (pos = strfind(string, search, ignorecase, pos))) {
        strdel(string, pos, pos + sublen); len -= sublen;
		if(replen && len + replen < maxlen) {
            strins(string, replacement, pos, maxlength); pos += replen; len += replen; }
        if (limit != -1 && ++count >= limit) break; }

    return count; }

LINE:

Код:

stock strreplace(string[], const search[], const replacement[], bool:ignorecase = false, pos = 0, limit = -1, maxlength = sizeof(string)) {

[MattTucker]

I believe you already have strlib included?
If not, I'd advise to use it, using libraries always saves time for a developer.