java 正则表达式工具类

//使用abstract目的是为了让使用者只能调用getInstance获取实例public abstract class RegexUtil { public static void main(String[] args) { RegexUtil ru = RegexUtil.getInstance(); String regexp = "(//d+.//d+.//d+.//d+):(//d+)"; String data = "ldap://192.168.16.152:389/"; System.out.println(">>>" + ru.matchGroup(regexp, data).size()); } public List<String> matchGroup(String regexp, String data) { Pattern p = Pattern.compile(regexp); Matcher matcher = p.matcher(data); List<String> list = null; while (matcher.find()) { int length = matcher.groupCount(); list = new java.util.ArrayList<String>(length); for (int i = 1; i < length + 1; i++) { list.add(matcher.group(i)); } } return list; } private static RegexUtil ru = null; //单太模式 public static RegexUtil getInstance() { if (ru == null) { ru = new RegexUtil() { }; } return ru; }}