title: Regex match multibyte numbers
body: <p>I need to match multi-byte ０１２３４５６７８９ characters from Japanese using a regular expression.</p>
  <p><code>[0-9]</code> does not work in this case. How can I got about making this regex? This is my first foray into matching multi-byte strings.</p>
  <h1>UPDATE</h1>
  <p>Matching a 4 digit string, such as birth year, was successful with both UTF-8 and non UTF-8 using the following <code>regex</code></p>
  <p><code>^([0-9]{4}||[\uFF10-\uFF19]{4})$</code></p>