Chrome Docker container name client-side validation doesn't work on Chrome 114

Follow these steps to reproduce:

• go to "Wiki Administration / Content / PDF Export" and set the Chrome Docker container name to "%^&*" (without the quotes)
• click outside the text input in order to lose the focus and trigger the client-side validation

Expected: the text input border turns red to indicate that its value is not valid.
Actual: the text input border remains blue, and the value is considered valid

This is a regression caused by a change in the Chrome behaviour between v113 and v114. If you check the JavaScript console:

• on v113 we get the following warning:

  Pattern attribute value [a-zA-Z0-9][a-zA-Z0-9_.-]+ is valid with the RegExp `u` flag, but not with the `v` flag: Uncaught SyntaxError: Invalid regular expression: /[a-zA-Z0-9][a-zA-Z0-9_.-]+/v: Invalid character in character class. See https://crbug.com/1412729
  

• on v114 we get the following error:

  Pattern attribute value [a-zA-Z0-9][a-zA-Z0-9_.-]+ is not a valid regular expression: Uncaught SyntaxError: Invalid regular expression: /[a-zA-Z0-9][a-zA-Z0-9_.-]+/v: Invalid character in character class
  

The linked Chrome issue is https://bugs.chromium.org/p/chromium/issues/detail?id=1412729 .