Inspecting regular expressions that contain backslashes (\)
followed by slashes (/) result in invalid ~r// expressions:
iex(1)> Regex.compile("a\\/b")
{:ok, ~r/a\\/b/}
iex(2)> Regex.match?(~r/a\\/b/, "a/b")
** (SyntaxError) iex:2: syntax error before: ','