When matching, the first character class will match H. Because we used the star, it’s OK if the second character class matches nothing. The star repeats the second character class. The second character class matches a letter or digit. The first character class matches a letter. matches an HTML tag without any attributes. The plus tells the engine to attempt to match the preceding token once or more. The asterisk or star tells the engine to attempt to match the preceding token zero or more times. It tells the engine to attempt to match the preceding token zero times or once, in effect making it optional. One repetition operator or quantifier was already introduced: the question mark.
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