subSequence

Returns a CharSequence that is a subsequence of this sequence. The subsequence starts with the char value at the specified index and ends with the char value at index end - 1. The length (in chars) of the returned sequence is end - start, so if start == end then an empty sequence is returned.

Parameters

Throws

      if `start` or `end` are negative,
      if `end` is greater than `length()`,
      or if `start` is greater than `end`

      if a value in the range `start`-`end` is an ECI (@see #isECI)