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Matcher replaceAll(String) method in Java with Examples

Last Updated : 01 Jul, 2020
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The replaceAll(String) method of Matcher Class behaves as a append-and-replace method. This method reads the input string and replace it with the matched pattern in the matcher string. Syntax: 
public String replaceAll(String stringToBeReplaced)
Parameters: This method takes a parameter stringToBeReplaced which is the String to be replaced in the matcher. Return Value: This method returns a String with the target String constructed by replacing the String. Below examples illustrate the Matcher.replaceAll() method: Example 1: Java 
// Java code to illustrate replaceAll() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "(Geeks)";

        // Create a pattern from regex
        Pattern pattern = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GeeksForGeeks Geeks for For Geeks Geek";

        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);

        System.out.println("Before Replacement: "
                           + stringToBeMatched);

        // Get the String to be replaced
        String stringToBeReplaced = "GFG";
        StringBuilder builder
            = new StringBuilder();

        // Replace every matched pattern
        // with the target String
        // using replaceAll() method
        System.out.println("After Replacement: "
                           + matcher
                                 .replaceAll(stringToBeReplaced));
    }
}
Output: 
Before Replacement: GeeksForGeeks Geeks for For Geeks Geek
After Replacement: GFGForGFG GFG for For GFG Geek
Example 2: Java 
// Java code to illustrate replaceAll() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "(FGF)";

        // Create a pattern from regex
        Pattern pattern = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF";

        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);

        // Get the String to be replaced
        String stringToBeReplaced = "GFG";
        StringBuilder builder
            = new StringBuilder();

        // Replace every matched pattern
        // with the target String
        // using replaceAll() method
        System.out.println("After Replacement: "
                           + matcher
                                 .replaceAll(stringToBeReplaced));
    }
}
Output: 
After Replacement: GGFGGGFGGGFGGGFGGFG GFG GFG GFG GFG
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#replaceAll-java.lang.String-

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Kirti_Mangal
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