The String.replaceAll(String regex, String replacement) method replaces each substring of this string that matches the given regular expression with the given replacement.

Java String.replaceAll() Method Example

This is a complete example to demonstrate the usage of replaceAll()  methods.

public class ReplaceAllExample {
    public static void main(String[] args) {
        String str = "javaguides";
        String subStr = str.replaceAll("[a-z]", "java");
        System.out.println(subStr);
    }
}

Output:

javajavajavajavajavajavajavajavajavajava 

Reference

https://www.javaguides.net/2018/08/java-string-class-api-guide.html

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