Java基于正则表达式实现查找匹配的文本功能【经典实例】

2019-11-26 12:42:05

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本文实例讲述了Java基于正则表达式实现查找匹配的文本功能。分享给大家供大家参考，具体如下：

REMatch.java：

package reMatch;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * Created by Frank */public class REMatch {  public static void main(String[] args) {    String patt = "Q[^u]//d+//.";    Pattern r = Pattern.compile(patt);    String line = "Order QT300. Now! QT400.";    Matcher m = r.matcher(line);    while (m.find()) {      // group(0)或group()将会返回整个匹配的字符串（完全匹配）；group(i)则会返回与分组i匹配的字符      // 这个例子只有一个分组      System.out.println(patt + " matches /"" + m.group(0) + "/" in /"" + line + "/"");      System.out.println("start:" + m.start() + " end:" + m.end());/*输出： Q[^u]/d+/. matches "QT300." in "Order QT300. Now! QT400."start:6 end:12Q[^u]/d+/. matches "QT400." in "Order QT300. Now! QT400."start:18 end:24*/    }  }}

eclipse运行结果如下图：

REMatchTwoFields.java：

package reMatchTwoFields;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * Created by Frank */public class REMatchTwoFields {  public static void main(String[] args) {    String inputLine = "Adams,John Quincy";    Pattern r = Pattern.compile("(.*),(.*)");    Matcher m = r.matcher(inputLine);    if (!m.matches()) {      throw new IllegalArgumentException("Bad Input");    }    // 分组0得到的是整个原字符串    for (int i = 0; i < m.groupCount() + 1; i++) {      System.out.println("分组" + i + ":" + m.group(i));/*输出： 分组0:Adams,John Quincy分组1:Adams分组2:John Quincy*/    }  }}

eclipse运行结果如下图：