[SuperViper]

pawn Код:

strreplace(string[], find[], replace[])
{
    new stringFound = strfind(string, find);
    if(stringFound > -1)
    {
        strdel(string, stringFound, strlen(find));
        strins(string, replace, stringFound);
    }
    return string;
}

Untested since I just wrote it up, not sure if it'll work.