CODEWITHSUNDEEP
javascriptregex
acontell
acontell

Reputation: 6932

javascript number regular expression

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

Upvotes: 1

Views: 111

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627468

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.

Upvotes: 1

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