本文實例講述了Java基于正則表達式實現查找匹配的文本功能。分享給大家供大家參考，具體如下：
REMatch.java：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
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()將會返回整個匹配的字符串（完全匹配）；group(i)則會返回與分組i匹配的字符 // 這個例子只有一個分組 System.out.println(patt + " matches \"" + m.group(0) + "\" in \"" + line + "\""); System.out.println("start:" + m.start() + " end:" + m.end());/*輸出： 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運行結果如下圖：
REMatchTwoFields.java：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
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"); } // 分組0得到的是整個原字符串 for (int i = 0; i < m.groupCount() + 1; i++) { System.out.println("分組" + i + ":" + m.group(i));/*輸出： 分組0:Adams,John Quincy分組1:Adams分組2:John Quincy*/ } }} |
eclipse運行結果如下圖：
希望本文所述對大家java程序設計有所幫助。
