java replaceall with regex example

Example 1: replaceall in java

public class ReplaceAllExample{  
public static void main(String args[]){  
String s1="Google is a very good website";  
String replaceString=s1.replaceAll("a","e");//replaces all occurrences of "a" to "e"  
System.out.println(replaceString);  
}}

Example 2: java replaceall single character

.replaceAll("(?<!\\S)[^ ](?!\\S)", " ").trim()