title: A regex pattern which is hard for me
body: <p>i'm beginner on regex.
  I need to do this : </p>
  
  <pre><code>wanna match : (bkz: bakınız) 
  wanna match : (bkz:falan filan) 
  wanna match : (bkz: falan filan) 
  wanna match : (bkz: sen kimsin?) 
  wanna match : (bkz: ali ata bak)
  wanna match : (bkz : selam)
  wanna match : (bkz: ŞEYTAN)
  wanna match : (bkz:ateş!)
  wanna match : (bkz: ali)
  wanna match : (bkz: ALİCAN) 
  wanna match : (bkz: ali ata bak)
  wanna match : (bkz:a) 
  wanna match : (bkz ali)
  wanna match : (bkz. deneme)
  DONT WANNA PARSE : (bkz : http://google.com.tr)
  DONT WANNA PARSE : (bkz: ) 
  DONT WANNA PARSE :(bkz. (bkz: sss))
  DONT WANNA PARSE :(bkz (bkz. (bkz: sss))) 
  </code></pre>
  
  <p>my regex so far: <code>/(?&lt;!(?:bkz: ))(?:\(bkz.?[:;\. ]?)([\w şŞüÜçÇıİğĞöÖ?!]+)\)/gmi</code></p>
  
  <p>See it live: <a href="http://regex101.com/r/pK6yZ1/4" rel="nofollow">http://regex101.com/r/pK6yZ1/4</a></p>
  
  <p>What do I need to do?</p>