How to optimize number regex in javascript?

@hal.littel 

To optimize a number regex in JavaScript, you can follow these tips:

1. Use specific quantifiers: Instead of using generic quantifiers like "*" or "+", try to be as specific as possible. For example, if you know that the number should have a specific number of digits, use "{n}" to specify that exact number.
2. Use character classes: Instead of using individual characters or ranges, use character classes like "d" to match any digit character.
3. Use anchors: If you know where the number should start or end, use anchors like "^" and "$" to match the beginning and end of the string.
4. Avoid unnecessary grouping: If you don't need to capture a specific part of the number, avoid using unnecessary grouping with parentheses.
5. Test and optimize: Test your regex with different types of numbers to ensure it matches correctly, and adjust it as needed for better performance.

Here's an example of an optimized regex pattern for matching integers in JavaScript:

1

const numberRegex = /^[+-]?d+$/;

This pattern will match integers with optional positive or negative signs at the beginning.