An optional escape rule that depicts whether a character must be escaped because it cannot be used at the target site. If null, CharacterEscape.Never will be used.
The value of offset in, plus the number of characters in input in that have been processed. If equal to offset in, this string operation will not have performed any processing. May be 1- iff output in is null to indicate that processing will be performed and that this method needs to be called again with a string builder.
Processes the character sequence in input in starting at the given offset in.