You can get the length of a Strings using the
length() command, or eliminate extra characters using the trim() command. This example shows you how to use both commands.
There is no circuit for this example, though your board must be connected to your computer via USB and the serial monitor window of the Arduino Software (IDE) should be open.
trim() is useful for when you know there are extraneous whitespace characters on the beginning or the end of a String and you want to get rid of them. Whitespace refers to characters that take space but aren't seen. It includes the single space (ASCII 32), tab (ASCII 9), vertical tab (ASCII 11), form feed (ASCII 12), carriage return (ASCII 13), or newline (ASCII 10). The example below shows a String with whitespace, before and after trimming:
Last revision 2015/08/11 by SM