I think you need to use the global flag in the regex:
str = str.replace(/[^a-z0-9]/ig, '').toLowerCase();
As this string will return false:
isPalindrome("a.b.a") -> false isPalindrome("ab.a") -> true
isPalindrome("a.b.a") -> false
isPalindrome("ab.a") -> true
Very true @Theofanis Despoudis — serious omission there.
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I think you need to use the global flag in the regex:
str = str.replace(/[^a-z0-9]/ig, '').toLowerCase();As this string will return false:
isPalindrome("a.b.a") -> falseisPalindrome("ab.a") -> trueVery true @Theofanis Despoudis — serious omission there.