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import re _tag_check = re.compile("^\w+[\w-]*$", re.UNICODE) def is_valid_tag(tagname): """Return True if the tag meets our tag requirements.""" return _tag_check.match(tagname) def is_valid_tag_list(tag_list): """Validate a tag_list string. @param tag_list: string like london, server which will be split on the commas and each tag verified for validity. """ if not tag_list: return True return all(is_valid_tag(tag.strip()) for tag in tag_list.split(","))