JSON numbers Regular Expression

Question

I\'m trying to write a regular expression for strings that are numbers in JSON. I\'m still new to writing Regular expressions, I found a diagram of a machine for JSON numbers h

Answer 1

For reference, here's the "number" diagram from http://www.json.org/fatfree.html:

The regex that should match this is:

-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?