Matcher region not mutating the matcher

[thesamet]

Matcher.region() is returning an instance of a new matcher with the given start and end position:

scala-js/javalib/src/main/scala/java/util/regex/Matcher.scala

Lines 228 to 229 in 92737aa

	def region(start: Int, end: Int): Matcher =
	new Matcher(pattern0, input0, start, end)

The behavior on the JVM is that the region is updated in-place: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Matcher.html#region(int,%20int)

[sjrd]

Thanks for the report :)

[thesamet]

As a workaround, I changed my instance to var so I can re-assign the returned value to the same variable (rather than mutating). I then noticed at least one more inconsistency with the JVM object that triggered IllegalStateException. I'll file a separate bug later.