Styles

#First way

Pattern p = Pattern.compile(".s", Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher("aS");  
boolean s1 = m.matches();  
System.out.println(s1);   // Outputs: true

#Second way

boolean s2 = Pattern.compile("[0-9]+").matcher("123").matches();  
System.out.println(s2);   // Outputs: true

#Third way

boolean s3 = Pattern.matches(".s", "XXXX");  
System.out.println(s3);   // Outputs: false