void setup(){
    println("PalindromeDetection");

    String[] tests = {
        "abcba",
        "aa",
        "a",
        "",
        " ",
        "ab",
        "abcdba",
        "A man, a plan, a canal: Panama!",
        "Dammit, I’m Mad!",
        "Never odd or even",
        "ingirumimusnocteetconsumimurigni"
    };

    for (int i = 0; i < tests.length; i++){
        println((i + 1) + ". '" + tests[i] + "' isExactPalindrome: " + isExactPalindrome(tests[i]) + " isInexactPalindrome: " + isInexactPalindrome(tests[i]));
    }
}

/*
* Check for exact palindrome using StringBuilder and String since String in Java does not provide any reverse functionality because Strings are immutable.
*/
boolean isExactPalindrome(String s){
	StringBuilder sb = new StringBuilder(s);
	return s.equals(sb.reverse().toString());
}

/*
* Check for inexact palindrome using the check for exact palindromeabove.
*/
boolean isInexactPalindrome(String s){
    // removes all whitespaces and non-visible characters,
    // remove anything besides alphabet characters
    // ignore case
    return isExactPalindrome(s.replaceAll("\\s+","").replaceAll("[^A-Za-z]+", "").toLowerCase());
}