java - 我该如何更换这个？

Question

如何替换这个

String str = "KMMH12DE1433";
String pattern = "^[a-z]{2}([0-9]{2})[a-z]{1,2}([0-9]{4})$";
String str2 = str.replaceAll(pattern, "repl");
Log.e("Founded_words2",str2);

我得到的是:KMMH12DE1433

我想要的是:MH12DE1433

Answer 1

使用正确的 java.util.regex.Pattern 和 java.util.regex.Matcher 尝试这样的操作:

    String str = "KMMH12DE1433";
    //Make the pattern, case-insensitive using (?i)
    Pattern pattern = Pattern.compile("(?i)[a-z]{2}([0-9]{2})[a-z]{1,2}([0-9]{4})");
    //Create the Matcher
    Matcher m = pattern.matcher(str);
    //Check if we find anything
    if(m.find()) {
        //Use what you found - with proper capturing groups you 
        //gain access to parts of your pattern as needed 
        System.out.println("Found this: " + m.group());
    }