regex - Remove Everything between Round brackets in PHP? -

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I want to remove round brackets and anything between them. Which RE I used? I have experimented under the code but like some languages ​​Hindi does not work for some time. Please help me anybody. 

  nl2br (preg_replace ( "/ \ ([^)] + \) /", "", $ main_ary [$ y] "" ")); // ex. 4.4. 2 (KitKat) operating system // I want Android 4.4.2 on the operating system

you can use regular expressions () ) lazy choose to leave the characters of all kinds to the first occurrence of the next character (. *? ) was. 

  preg_replace ( "/\(.*?\)/"/""$$$$$$$$$$$$$$$$$$$$$% >

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