What is the {L} Unicode category?

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Taken from this link: http://www.regular-expressions.info/unicode.html

Check the Unicode Character Properties section.

\p{L} matches a single code point in
the category “letter”. If your input
string is à encoded as U+0061 U+0300,
it matches a without the accent. If
the input is à encoded as U+00E0, it
matches à with the accent. The reason
is that both the code points U+0061
(a) and U+00E0 (à) are in the category
“letter”, while U+0300 is in the
category “mark”.

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