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// String userSN = "Sherlock Holmes"; // Valid
// String userPassword = "secret2";   // Valid

sc.setSearchScope(SearchControls.SUBTREE_SCOPE);
String base = "dc=example,dc=com";
           
if(!userSN.matches("[a-zA-Z\\w\\s]*") || !userPassword.matches("[a-zA-Z0-9\\w]*")) {
  throw new IllegalArgumentException("Invalid input");
} 
            	
String filter = "(&(sn = " + userSN + ")(userPassword=" + userPassword + "))";