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HomeJavajavaTutorialFour commonly used processing methods of Java regular expressions (matching, segmentation, substitution, acquisition)

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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