Regex with the 's' flag does not match newlines with '.'

scala

```
scala> val that = """|<p><code>
                     |List(1)
                     |</code></p>""".stripMargin
scala> "(?s).*<code>(.*?)</code>.*".r.pattern.matcher(that).matches()
res1: Boolean = true
```

vs
scalajs

``` scala
dom.console.log("(?s).*<code>(.*?)</code>.*".r.pattern.matcher(that).matches()) // false
```
