<pre class="shiki github-dark shaku"><code>/** * @param {string} str * @returns {boolean} */function validateNumberString(str) { return /^[+-]?(([1-9]\d+|[0-9])(\.\d*)?|\.\d+)(e[+-]?\d+)?$/i.test(str)}</code></pre>

validateNumberString with RegEx

Give a number string, check if it is valid number. By "valid", we mean if it validates as one of below formats: 1. integer, such as '0', '-1' 2. decim…