PHP preg_match function always return false? -


I just started learning PHP days ago and got the hand with the preg_match () function I am wondering why the following always makes false? 

  preg_match ('[AZ] {2}', 'CA')    
 
 
 This is not a valid regular expression, you are missing the delimiter:  
  preg_match ('/ [AG] {2} /', 'CA' )   
  /  is a common delimiter but you want to use any limit (unless it is alphanumeric, not a backslash or whitespace ):  
  preg_match ('@ [AZ] {2} @', 'ca') preg_match ('% [AZ] {2}%', 'ca')   
 
 You also get a warning about missing delimiters Education will be notified. Turn on / off your error reporting level

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