Replace String

最新推荐文章于 2024-05-10 08:12:27 发布

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最新推荐文章于 2024-05-10 08:12:27 发布

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原文链接：http://www.cnblogs.com/superbo/p/4112113.html

本文介绍了如何通过编程方法在给定字符串中区分大小写地替换字母'a'和'A'为'one'和'ONE'。通过使用正则表达式，实现了单个字符的替换而不影响其作为单词的一部分。示例代码演示了完整的解决方案。

Problem

From a given string, replace all instances of 'a' with 'one' and 'A' with 'ONE'.
Example Input: " A boy is playing in a garden"
Example Output: " ONE boy is playing in onegarden"
-- Not that 'A' and 'a' are to be replaced only when theyare single characters, not as part of another word.

Solution

 1 public static String replaceString(String s) {
 2     // s = s.replace("a ", "one ");
 3     // s = s.replace("A ", "ONE ");
 4 
 5 //        s = s.replaceAll("\\b(a)", "one");
 6 //        s = s.replaceAll("\\b(A)", "ONE");
 7 
 8     StringBuilder sb = new StringBuilder();
 9     for(String str : s.split(" ")) {
10         if(str.equals("a"))    sb.append("one ");
11         else if(str.equals("A")) sb.append("ONE ");
12         else sb.append(str + " ");
13     }
14     
15     return sb.toString();
16 }