javascript number regular expression

Question

I've come up with this regular expression to validate a javascript number according to the specification:

(-|\+|)(\d+\.?\d*|\.\d+)([eE](-|\+|)\d+)?

As far as I can think of, these are valid numbers in js:

123,123.3, .3, -123, -.3, -.3e-2, -.3e+2, +.2e2... and so forth.

I've been trying to find a verified regular expression on the internet so that I could compare my solution but to no avail.

Could anyone tell me if my approach is correct or give me a better solution?

Link to test my solution

And yet, you seem to be trying to match valid numbers in js ? — adeneo
– adeneo, Commented Apr 3, 2015 at 21:19
no, that's not the point. The point is I want to figure out a regular expression that could validate a js number — acontell
– acontell, Commented Apr 3, 2015 at 21:20
@acontell what's the end goal of validating js-valid numbers? — royhowie
– royhowie, Commented Apr 3, 2015 at 21:21

Wiktor Stribiżew · Accepted Answer · 2015-04-03 21:29:51Z

1

While using isNan is the correct way of checking numbers in JavaScript, you can also validate floating point numbers with [-+]?[0-9]*\.?[0-9]+(?:[eE][-+]?[0-9]+)? regex (taken from Regular-Expressions.info).

Consider using appropriate anchors though! (^ for string start, $ for string end).

Demo is available here.

answered Apr 3, 2015 at 21:29

Wiktor Stribiżew

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