Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static String getDateFromString(String content) { try { String strPattern = "DB_PoliceOfficeWork_(\\d{4}-\\d{2}-\\d{2}).db"; Pattern pattern = Pattern.compile(strPattern); Matcher matcher = pattern.matcher(content); while (matcher.find()) { return matcher.group(1); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return ""; } }