import java.util.ArrayList; import java.util.regex.Matcher; import java.util.regex.Pattern; public class test { public void main() { getStrings(); //用正则表达式获取指定字符串内容中的指定内容 System.out.println("********************"); replace(); //用正则表达式替换字符串内容 System.out.println("********************"); strSplit(); //使用正则表达式切割字符串 System.out.println("********************"); strMatch(); //字符串匹配 } private static void strMatch() { String phone = "13539770000"; //检查phone是否是合格的手机号(标准:1开头,第二位为3,5,8,后9位为任意数字) System.out.println(phone + ":" + phone.matches("1[358][0-9]{9,9}")); //true String str = "abcd12345efghijklmn"; //检查str中间是否包含12345 System.out.println(str + ":" + str.matches("\\w+12345\\w+")); //true System.out.println(str + ":" + str.matches("\\w+123456\\w+")); //false } private static void strSplit() { String str = "asfasf.sdfsaf.sdfsdfas.asdfasfdasfd.wrqwrwqer.asfsafasf.safgfdgdsg"; String[] strs = str.split("\\."); for (String s : strs){ System.out.println(s); } } private static void getStrings() { String str = "rrwerqq84461376qqasfdasdfrrwerqq84461377qqasfdasdaa654645aafrrwerqq84461378qqasfdaa654646aaasdfrrwerqq84461379qqasfdasdfrrwerqq84461376qqasfdasdf"; Pattern p = Pattern.compile("qq(.*?)qq"); Matcher m = p.matcher(str); ArrayList<String> strs = new ArrayList<String>(); while (m.find()) { strs.add(m.group(1)); } for (String s : strs){ System.out.println(s); } } private static void replace() { String str = "asfas5fsaf5s4fs6af.sdaf.asf.wqre.qwr.fdsf.asf.asf.asf"; //将字符串中的.替换成_,因为.是特殊字符,所以要用\.表达,又因为\是特殊字符,所以要用\\.来表达. str = str.replaceAll("\\.", "_"); System.out.println(str); } }