Swift 5.7 Regex failed to match Foundation URL

Code to reproduce:

let inputString = "url(https://example.com)"

let regex = Regex {
  "url("
  Capture {
    .url()
  }
  ")"
}
guard let (_, url) = inputString.firstMatch(of: regex)?.output else {
  fatalError()
}
print(url)

Regex matches if we change "url(" to "(":

let regex = Regex {
  "("
  Capture {
    .url()
  }
  ")"
}

However, the output is

Is this a bug?