How to write regular expression with the given Cyrillic and Unicode?

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There is a regular expression:

$se = preg_replace('%[^A-Za-zА-Ha-H0-9]%', ", $se);

It cuts out all line characters, leaving only letters and numbers. You could rewrite it so that it worked on machines who do not know Cyrillic. To do this, if I understand correctly, the Cyrillic range should be written in the form hex-sequences (such as \\x0410), I can't find how to do it correctly.

Please help
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1 Answer

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First you need to use the modifier u (if the file is in UTF-8 ranges "a-I" will work), and secondly you can use the notation \\p{xx}.

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