insert

>>-insert(new-+-----------------------------------------+--)><
              +-,--+---+--+--------------------------+--+
                   +-n-+  +-,--+--------+--+------+--+
                               +-length-+  +-,pad-+

Inserts the string [new] , padded or truncated to length [length] , into the mutable buffer after the n'th character. The default value for [n] is 0, which means insertion at the beginning of the string. If specified, [n] and length must be positive integers or zeros. If [n] is greater than the length of the buffer contents, the string new is padded at the beginning. The default value for [length] is the length of [new] . If length is less than the length of string [new] , insert truncates [new] to length [length] . The default [pad] character is a blank.