Specifies that matching pairs of this character delimit string constants in this tokenizer.
nextToken method encounters a string constant, the
ttype field is set to the string delimiter and the
sval field is set to the body of the string.
If a string quote character is encountered, then a string is recognized, consisting of all characters after (but not including) the string quote character, up to (but not including) the next occurrence of that same string quote character, or a line terminator, or end of file. The usual escape sequences such as
"\t" are recognized and converted to single characters as the string is parsed.
Any other attribute settings for the specified character are cleared.
@param ch the character.