[20-05-26][Thinking in Java 45]Java String 3 - Replace

 1 package test_21_3;
 2 
 3 import java.util.regex.Matcher;
 4 import java.util.regex.Pattern;
 5 
 6 public class ReplaceString {
 7 
 8     public static void main(String[] args) {
 9         
10         String str = "Twas brillig, and the slithy toves\n" +
11                  "Did gyre and gimble in the wabe.\n" + 
12                  "All mimsy were the borogoves,\n" + 
13                  "Beware the Jabberwock, my son,\n" +
14                  "The jaws that bite, the claws that catch.\n" + 
15                  "Beware the Jubjub bird, and shun\n" + 
16                  "The frumious Bandersnatch.";
17         
18         String regex1 = "\\bb\\w+\\b";
19         // 替换第一个匹配项
20         String srf = str.replaceFirst(regex1, "[ReplaceFirst]");
21         
22         System.out.println(srf);
23         System.out.println("---------------");
24         
25         String regex2 = "\\ba\\w+\\b";
26         // 替换所有匹配项
27         String sra = str.replaceAll(regex2, "[ReplaceAll]");
28         
29         System.out.println(sra);
30         System.out.println("----------------");
31         
32         StringBuffer sbuf = new StringBuffer();
33         String regex3 = "[aeiou]";
34         Pattern p = Pattern.compile(regex3);
35         Matcher m = p.matcher(str);
36         
37         // 替换前15个匹配项
38         for (int i = 0; i < 15; i++) {
39             m.find();
40             m.appendReplacement(sbuf, m.group().toUpperCase());
41         }
42         // 将剩下的部分复制进sbuf
43         m.appendTail(sbuf);
44         
45         System.out.println(sbuf);
46                 
47     }
48 }