


java 正则表达式高级篇,介绍四种常用的处理方式:匹配、分割、替代、获取,具体内容如下
package test; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * 正则表达式 * 正则表达式 的用法主要是4种方面的使用 * 匹配,分割,替换,获取. * 用一些简单的符号来代表代码的操作 * @author cyc * */ public class Rex { public static void main(String[] args) { //针对字符串处理 Rex reg = new Rex(); //校验qq的reg正则表达式 //这里的\w 是指的是[a-zA-Z0-9],还有一个重要的是?,*.+这三个分别 //?表示出现1次或者1次都没有, //+表示出现1次或者n次, //*表示出现0次或者n次, //还有些特殊的写法X{n}恰好n次X{n,}至少n次,X{n,m}n次到m次, String mathReg = "[1-9]\\d{4,19}"; String divisionReg = "(.)\\1+"; //\\b 是指的边界值 String getStringReg = "\\b\\w{3}\\b"; //字符串匹配(首位是除0 的字符串) reg.getMatch("739295732",mathReg); reg.getMatch("039295732",mathReg); //字符串的替换 //去除叠词 reg.getReplace("12111123ASDASDAAADDD",divisionReg,"$1"); //字符串的分割 //切割叠词,重复的 //这里要知道一个组的概念(.)\\1第二个和第一个至相同 reg.getDivision("aadddddasdasdasaaaaaassssfq",divisionReg); //字符串的获取 //现在获取三个字符串取出 reg.getString("ming tian jiu yao fangjia le ",getStringReg); } /** * 获取查询的字符串 * 将匹配的字符串取出 */ private void getString(String str, String regx) { //1.将正在表达式封装成对象Patten 类来实现 Pattern pattern = Pattern.compile(regx); //2.将字符串和正则表达式相关联 Matcher matcher = pattern.matcher(str); //3.String 对象中的matches 方法就是通过这个Matcher和pattern来实现的。 System.out.println(matcher.matches()); //查找符合规则的子串 while(matcher.find()){ //获取 字符串 System.out.println(matcher.group()); //获取的字符串的首位置和末位置 System.out.println(matcher.start()+"--"+matcher.end()); } } /** * 字符串的分割 */ private void getDivision(String str, String regx) { String [] dataStr = str.split(regx); for(String s:dataStr){ System.out.println("正则表达式分割++"+s); } } /** * 字符串的替换 */ private void getReplace(String str, String regx,String replaceStr) { String stri = str.replaceAll(regx,replaceStr) ; System.out.println("正则表达式替换"+stri); } /** * 字符串处理之匹配 * String类中的match 方法 */ public void getMatch(String str, String regx){ System.out.println("正则表达匹配"+str.matches(regx)); } }
以上就是Java正则表达式的全部内容,希望对大家的学习有所帮助
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