正規表現でマッチした文字列を取得する
備忘録。
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexSample { public void main(String[] args) { String date = "20110101"; Pattern pattern = Pattern.compile("^(\\d{4})(\\d{2})(\\d{2})$"); Matcher matcher = pattern.matcher(date); String target; if(matcher.find()) { target = matcher.group(1) + "/" + matcher.group(2) + "/" + matcher.group(3); System.out.println(target); // => 2011/01/01 } } }