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longest_prefix(string) => integer
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Return the length of the longest prefix of string that exists in the trie.
Examples
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code:: python
>>> import ahocorasick
>>> A = ahocorasick.Automaton()
>>> A.add_word("he", True)
True
>>> A.add_word("her", True)
True
>>> A.add_word("hers", True)
True
>>> A.longest_prefix("she")
0
>>> A.longest_prefix("herself")
4
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