Simple password Strength checker

public class passwordStrength {

    private int checkPasswordStrength(String password) {
                int strengthPercentage=0;
        String[] partialRegexChecks = { ".*[a-z]+.*", // lower
                ".*[A-Z]+.*", // upper
                ".*[\\d]+.*", // digits
                ".*[@#$%]+.*" // symbols
        };


                    if (password.matches(partialRegexChecks[0])) {
                    strengthPercentage+=25;
            }
                    if (password.matches(partialRegexChecks[1])) {
                    strengthPercentage+=25;
            }
                    if (password.matches(partialRegexChecks[2])) {
                    strengthPercentage+=25;
            }
                    if (password.matches(partialRegexChecks[3])) {
                    strengthPercentage+=25;
            }


        return strengthPercentage;
    }

}