How do you replace all words in Java?

The replaceAll() method replaces each substring of this string (the String on which it is called) that matches the given regular expression with the given replacement. It internally uses classes like Pattern and Matcher from java. util. regex package for searching and replacing matching characters or substring.

If you replace a value, only the first instance will be replaced. To replace all instances, use a regular expression with the g modifier set .

To replace all words with another String using Java Regular Expressions, we need to use the replaceAll() method . The replaceAll() method returns a String replacing all the character sequence matching the regular expression and String after replacement.

The fill() method of java. util. Collections class is used to replace all of the elements of the specified list with the specified element.