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：
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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：
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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：
希望本文所述对大家java程序设计有所帮助。
