They both seem to work but I have been told you should use both when you're forming a RegExp?

<code>\s</code> matches any whitespace character, including tabs. <code>\t</code> only matches a tab character. <code>\t</code> being a subset of <code>\s</code>, you should not have to use both at the same time.

<code>\s</code> matches a single whitespace character, which includes spaces, tabs, form feeds, line feeds and other unicode spaces. <code>\t</code> Matches a single tab. If you are using <code>\s</code>, you don't need to include <code>\t</code>. More information on regex patterns here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp