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Why this re.search not working

Why re.search can't find the pattern?

str = "<a href='http://'>\ntest\n'</a>"
re.search(r"<a[^>]+>.", str, re.MULTILINE)

. won't match a newline unless you use re.DOTALL

mystr = "<a href='http://'>\ntest\n'</a>"
re.search(r"<a[^>]+>.", mystr, re.MULTILINE|re.DOTALL)

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