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).

• Blender: You'll have more luck parsing it character-by-character.
• Dogbert: You just want to check if a character is one of those?
• Phil: @Dogbert Yes. That's all.

Answer 1

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.