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