What does replaceAll do in Java?

The Java string replace() method will replace a character or substring with another character or string. The syntax for the replace() method is string_name. replace(old_string, new_string) with old_string being the substring you’d like to replace and new_string being the substring that will take its place.

Java String replace(char old, char new) method example

replaceAll() Method. The replaceAll() method is similar to the String. replaceFirst() method. The only difference between them is that it replaces the sub-string with the given string for all the occurrences present in the string .