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Asked: 2026-06-14T04:55:37+00:00

I’m trying to write a regular expression for strings that are numbers in JSON.

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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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1 Answer

  1. Editorial Team

    For reference, here’s the “number” diagram from http://www.json.org/fatfree.html:

    JSON number

    The regex that should match this is:

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