Create a MATLAB function that checks whether a given string is a palindrome or not. A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward, ignoring spaces, punctuation, and capitalization.
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A lot of solutions are passing this due to insufficient testing. There is only one number in the tests and it's a 'pass', so solutions that remove all numbers from the input are passing because a null string counts as a palindrome.
Test suite has been updated to cover sufficient cases.
Though I was going to include cases with characters (as specified in the problem description), however as the reference solution provieded failed for such cases, I didn't proceed with it.