Javascript - RegExp to match ANY number, including Infinity, negative numbers, and e+/- numbers

Question

So I need a RegExp in Javascript to check for any number:

2 -> true
3.14 -> true
2. -> true
.2 -> true
0 -> true

And it should also work for these:

Infinity -> true
-Infinity -> true
-0 -> true
-22 -> true
2e-3 -> true
5e-14 -> true
3e+2 -> true
8e2 -> true

The d will only allow positive integers, which is far from what i need to my RegExp, and I am not good at all with RegExps, so what's the most efficient RegExp to do this?

@DavidThomas Because it's very easy to handle, and I am going to need this to replace stuff in strings.. — , Oct 18 '14 at 09:29
Ofcourse your tried a few solutions yourself. Show them here, so maybe we can review your solutions — KooiInc, Oct 18 '14 at 09:30
@KooiInc I've tried this but I just don't know what's next: \d+\.?\d* — , Oct 18 '14 at 09:31

anubhava · Accepted Answer · 2014-10-18T09:40:54.893

2

You can use this regex:

[-+]?(?:(?:\d+\.?\d*|\.\d+)(?:e[+-]?\d+)?|Infinity)

RegEx Demo

edited Oct 18 '14 at 09:40

answered Oct 18 '14 at 09:34

anubhava

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("2.").match(/[-+]?(?:(?:\d+\.?\d*|\.\d+)(?:e[+-]?\d+)?|Infinity)\b/g) Will return "2", not "2." – Oct 18 '14 at 09:40
ok it is corrected now. – anubhava Oct 18 '14 at 09:41

Javascript - RegExp to match ANY number, including Infinity, negative numbers, and e+/- numbers

1 Answers1

RegEx Demo