// 获取 public static void fuctionDemo_5() { String str = "yang cheng yong ben dan ba shi de ta hen sha"; String regex = "\\b[a-z]{3}\\b"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(str); while (m.find()) { System.out.println(m.group()); } } public static void fuctionDemo_4() { String str = "18758183839"; str = str.replaceAll("(\\d{3})\\d{4}(\\d{4})","$1****$2"); System.out.println(str); } // 分割1 public static void fuctionDemo_3() { String str = "yang8888cheng222yong"; str = str.replaceAll("(.)\\1+","$1"); System.out.println(str); } // 切割2 public static void fuctionDemo_2() { String s1 = "yang cheng yong beng dan"; String[] names = s1.split(" +"); for (String name : names) { System.out.println(name); } String s2 = "yang###sha@@@bi"; String[] names2 = s2.split("(.)\\1+"); for (String name : names2) { System.out.println(name); } } // 匹配手机号码是否正确 public static void fuctionDemo_1() { String num = "15958184259"; String regex = "1[358][0-9]{9}"; boolean b = num.matches(regex); System.out.println(num + ":" + b); }