title: Regex match any single character (one character only)
body: <p>How do you match any one character with a regular expression?</p>
  <p>A number of other questions on Stack Overflow sound like they promise a quick answer, but they are actually asking something more specific:</p>
  <ul>
  <li><a href="https://stackoverflow.com/questions/19393749/regex-match-only-one-occurrence-of-character">Regex for a string of repeating characters and another optional one at the end</a></li>
  <li><a href="https://stackoverflow.com/questions/1181271/regex-to-match-a-single-character-that-is-anything-but-a-space">regex to match a single character that is anything but a space</a></li>
  <li><a href="https://stackoverflow.com/questions/21051031/replace-character-in-regex-match-only">Replace character in regex match only</a></li>
  </ul>