Tests if the substring of this string beginning at the specified index starts with the specified prefix.

Parameters:

prefix		the prefix.
toffset		where to begin looking in this string.

Returns:  true if the character sequence represented by the argument is a prefix of the substring of this object starting at index toffset; false otherwise. The result is false if toffset is negative or greater than the length of this String object; otherwise the result is the same as the result of the expression

          this.substring(toffset).startsWith(prefix)