Remove double quotes using Java regular expressions.

In Java, you can use regular expressions to remove double quotes. Here is an example code:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RemoveQuotes {
    public static void main(String[] args) {
        String input = "\"Hello, World!\"";
        String output = removeQuotes(input);
        System.out.println(output);
    }
    
    public static String removeQuotes(String input) {
        Pattern pattern = Pattern.compile("\"(.*?)\"");
        Matcher matcher = pattern.matcher(input);
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            matcher.appendReplacement(sb, matcher.group(1));
        }
        matcher.appendTail(sb);
        return sb.toString();
    }
}

In the above code, we utilize the Pattern class and Matcher class for matching and replacing regular expressions. The regular expression “(.*?)” is used to match all content within double quotes. matcher.appendReplacement(sb, matcher.group(1)) replaces the matched content with the content inside the double quotes. Finally, matcher.appendTail(sb) adds the remaining portion to the StringBuffer and returns the result.

The output result of the code above is:

Hello, World!

Please note that this code only removes double quotes from the entire string. If you need to remove double quotes within double quotes, you can use a different method, such as the String.replace() method.