[Palindrome] #practice

Palindrome.groovy

import java.util.regex.Matcher

class Palindrome {
    static void main(String[] args) {
        def stuff = 'This, stuff ala ffuts, is a sentence to isPalindrome (tacocat)!!ONE!1!'
        findPalindromes(stuff, true, true)
        println '=================='
        findPalindromes(stuff, true, true, true)
        println '=================='
        findPalindromes(stuff, false, true)
        println '=================='
        findPalindromes(stuff, false, true, true)
//        println '=================='
//        findPalindromes(stuff, false, false)

        println '=================='
        findPalindromes('whattatoo', true, true, true)
        println '=================='
        findPalindromes('tacocat', true, true, true)
        println '=================='
        findPalindromes('burgercat', true, true, true)

    }

    static void findPalindromes(String full, boolean showLargest, boolean showFalse, boolean excludePunctuation = false) {
        for (int i = full.length(); i > 2; i--) {
            boolean canStop
            for (int j = 0; j <= (full.length() - i); j++) {
                String fragment = full.substring(j, (i + j))
                boolean isPalindrome = isPalindrome(fragment, excludePunctuation)
                if (isPalindrome) {
                    canStop = true
                }
                if (!showFalse || isPalindrome) {
                    println "${sprintf('%02d', i)} | ${sprintf('%02d', j)} | $fragment | palindrome=${isPalindrome}"
                }
            }
            if (canStop && showLargest) break
        }
    }

    static boolean isPalindrome(String fragment, boolean excludePuncuation) {
        if (excludePuncuation) {
            Matcher match = fragment =~ /.*\W+.*/
            if (match.matches()) return false
        }

        int offset = fragment.length() % 2
        boolean matches = true
        for (int i = 0; i < fragment.length() - offset; i++) {
            if (fragment.charAt(i) != fragment.charAt(fragment.length() - i - 1)) {
                matches = false
                break
            }
        }
        matches
    }
}