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In this example you'll see how we can create a small search and replace program using the regular expression classes in Java. The code below will replace all the brown word and change the color to red.

package org.kodejava.example.regex;

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

public class StringReplace {
public static void main(String[] args) {
String source = "The quick brown fox jumps over the brown lazy dog.";
String find = "brown";
String replace = "red";

//
// Compiles the given regular expression into a pattern
//
Pattern pattern = Pattern.compile(find);

//
// Creates a matcher that will match the given input against the pattern
//
Matcher matcher = pattern.matcher(source);

//
// Replaces every subsequence of the input sequence that matches the
// pattern with the given replacement string
//
String output = matcher.replaceAll(replace);

System.out.println("Source = " + source);
System.out.println("Output = " + output);
}
}