java字符串替换所有特定字符串后的第一个字符为小写

Question

I have a requirement to replace all the character within a string to lower case if it is followed by some string like "is".

For example:

String a = "name=xyz,isSalaried=Y,address=abc,isManager=N,salary=1000";

it should get converted to

"name=xyz,salaried=Y,address=abc,manager=N,salary=1000"

I am not very good at regular expression but I think can use it to achieve the required output. It will be great if someone can help me out.

Answer 1

Your solution requires basic understanding of String and String methods in java. Here is one working example. Although, it might not be the most efficient one. NOTE:- YOU ASKED FOR A REGEX SOLUTION.BUT THIS IS USING PURE STRING METHODS

public class CheckString{
    public static void main(String[] ar){
        String s = "name=xyz,isSalaried=Y,address=abc,isManager=N,salary=1000";
        String[] arr = s.split(",");
        String ans = "";
        int i = 0;
        for(String text : arr){
            int index = text.indexOf("=");
            String before = text.substring(0,index).replace("is","").toLowerCase();
            String after = text.substring(index);
            if(i!=(arr.length-1)){
                ans += before + after + ",";
                i++;
            }
            else{
                ans += before + after;  
            }
        }
        System.out.println(ans);
    }
}

Answer 2

Try this. first match the string and replace in a loop

    String a = "name=xyz,isSalaried=Y,address=abc,isManager=N,salary=1000";

    Matcher matcher = Pattern.compile("is(.*?)=").matcher(a);//.matcher(a).replaceAll(m -> m.group(1).toLowerCase());

    while (matcher.find()) {
        String matchedString = matcher.group(1);

        a = a.replace("is"+matchedString,matchedString.toLowerCase());
    }
    System.out.printf(a);