changeStr

>>-changeStr(needle,newneedle--+--------+--)---------------------------------><
                               +-,count-+

Returns the receiver MutableBuffer with [newneedle] replacing occurrences of [needle] .

If [count] is not specified, all occurrences of [needle] are replaced. If [count] is specified, it must be a positive, whole number that gives the maximum number of occurrences to be replaced.