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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 here , but I'm not sure how to attack it.
Here are some strings that should be found by the regex. "22", "55.75466", "-44.565" "55e-2" "69234.2423432 E78" Any help is appreciated!
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JSON can actually take the form of any data type that is valid for inclusion inside JSON, not just arrays or objects. So for example, a single string or number would be valid JSON.
The regex [0-9] matches single-digit numbers 0 to 9. [1-9][0-9] matches double-digit numbers 10 to 99. That's the easy part. Matching the three-digit numbers is a little more complicated, since we need to exclude numbers 256 through 999.
json . You can write your regex inside quotation marks after the "Regular expressions" : . Note that in JSON format, the \ is a special character called escape character. So you will have to write a double backslash \\ .
The integer type is used for integral numbers. JSON does not have distinct types for integers and floating-point values. Therefore, the presence or absence of a decimal point is not enough to distinguish between integers and non-integers. For example, 1 and 1.0 are two ways to represent the same value in JSON.
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+)?
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