Validating Email Addresses With a Filter

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    import re
    def fun(s):
        # return True if s is a valid email, else return False
        pattern = r'^[a-zA-Z0-9_-]+@[a-zA-Z0-9]+\.[a-zA-Z]{1,3}$'
        
        if (re.match(pattern, s)): return True
        else: return False