JavaScript regex for calculations

Question

I'm looking to match individual characters from a calculation string such as:

(123+321)*1.15

The list of characters I'd like to match is:

0-9, ., +, -, *, /, (, ), %

Each character of the string will be passed into a function individually. I think I have the starting point (which works great with the numbers):

if (character.match(/[0-9]{1}/) !== null) {
    // do something...
}

I'm not quite sure how to add the remaining characters though (I've always found regex confusing, even after reading countless articles on the subject).

You'll have more luck parsing it character-by-character.

Blender
– Blender

2013-04-15 19:49:07 +00:00
Commented Apr 15, 2013 at 19:49 — Blender
– Blender, Commented Apr 15, 2013 at 19:49
You just want to check if a character is one of those?

Dogbert
– Dogbert

2013-04-15 19:50:21 +00:00
Commented Apr 15, 2013 at 19:50 — Dogbert
– Dogbert, Commented Apr 15, 2013 at 19:50
@Dogbert Yes. That's all.

Phil
– Phil

2013-04-15 19:54:06 +00:00
Commented Apr 15, 2013 at 19:54 — Phil
– Phil, Commented Apr 15, 2013 at 19:54

Dogbert · Accepted Answer · 2013-04-15 19:54:39Z

2

You can just add the characters you want with the 0-9, like

character.match(/[0-9.+\-*/()%]/)

The only character needing to be escaped in the RegExp is -, as it normally means a range of characters.

There's no need of {1} as the default is to match 1 instance.

answered Apr 15, 2013 at 19:54

Dogbert

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