basic mod_rewrite / regexp question: Split ID with dash

I'm trying to do some htaccess redirects for cleaner URL's, but I failed to do.

Here is my intend:

/kitap/blah     => kitap.php?a=blah
/kitap/blah-123 => kitap.php?a=blah&b=123

This is my current code.

RewriteRule ^(kitap|yazar)/?([^/\.]+)?(-([0-9]+))?/?$ $1.php?a=$2&b=$3 [QSA,L,NC]

Currently it producing this:

/kitap/blah     => kitap.php?a=blah
/kitap/blah-123 => kitap.php?a=blah-开发者_开发百科123

The word "blah" can include Unicode characters, like ç,ö,ğ,ş etc. (This means [a-z0-9_] will not work in my situation)

How can I accomplish my intended result? I tried various things but no success. Thanks.

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I ended up with a "hybrid" solution from Alin and battal's comments.

RewriteRule ^(kitap|yazar)/?([^/\.-]+)?(-([0-9]+))?/?$ $1.php?a=$2&b=$4 [QSA,L,NC]

And it works. Thanks!

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RewriteRule ^(kitap|yazar)/?([^/\.-]+)?(-(\d+))?/?$ $1.php?a=$2&b=$4 [QSA,L,NC]

or

RewriteRule ^(kitap|yazar)/?(\p{L}+)?(-(\d+))?/?$ $1.php?a=$2&b=$4 [QSA,L,NC]

$4, not $3 unless you intend to use the dash -, if you use $3, $_GET['b'] will be equal to -123. Every pair of parantheses counts, so that $3 is -123, whereas $4 is 123.

\p means a unicode character, and {L} means a letter. You can see available modifiers at PHP PCRE regex - Unicode character properties. To use them, your version of PHP must be compiled with --enable-unicode-properties.