18、Java正则表达式：全面解析与应用实践

Java正则表达式：全面解析与应用实践

正则表达式在字符串处理中的应用

在Java编程中，字符串和正则表达式是紧密相连的。下面通过一个代码示例来展示如何使用正则表达式进行字符串的匹配和替换：

public static void main (String [] argv) 
{ 
    String input = "Thanks, thanks very much"; 
    String regex = "([Tt])hanks"; 
    Pattern pattern = Pattern.compile (regex); 
    Matcher matcher = pattern.matcher (input); 
    StringBuffer sb = new StringBuffer(); 

    // Loop while matches are encountered 
    while (matcher.find()) { 
        if (matcher.group(1).equals ("T")) { 
            matcher.appendReplacement (sb, "Thank you"); 
        } else { 
            matcher.appendReplacement (sb, "thank you"); 
        } 
    } 

    // Complete the transfer to the StringBuffer 
    matcher.appendTail (sb); 

    // Print the