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An RFC 6454 valid url. Must not include any paths. A single wildcard (*) can be used as the first subdomain.

Pattern: ^(https?|chrome-extension|moz-extension):\/\/(?!.*(\*).*(\*).*)[*a-zA-Z0-9._-]{1,256}(:[*0-9]{1,5})?$
Example:
{
  "title": "Example",
  "value": "http://*.example.com"
}