①Regexで正規表現のルールを定義する
②findFirstMatchIn()メソッドで一致する文字列を抽出する
sample.scala
var dateStr = "2013年12月31日"
var monthR : Regex = """[0-9]*月""".r;
var monthRM : Regex.Match = monthR.findFirstMatchIn(dateStr).get
//12月と出力される
println(monthRM.toString)
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