String replace with callback in Java (like in JavaScript)

Example.java

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

public class Example {
    public static void main(String[] args) {
        String result = StringReplacer.replace("Hello World!", Pattern.compile("\\d+"), m -> ("" + (Integer.parseInt(m.group()) * 2));
    }
}

StringReplacer.java

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

public class StringReplacer {
    public static String replace(String input, Pattern regex, Function<Matcher, String> callback) {
        StringBuffer resultString = new StringBuffer();
        Matcher regexMatcher = regex.matcher(input);
        while (regexMatcher.find()) {
            regexMatcher.appendReplacement(resultString, callback.apply(regexMatcher));
        }
        regexMatcher.appendTail(resultString);

        return resultString.toString();
    }
}

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