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        /*
        *      :
        *    (   ,   )
        *   .       :  
                   ,         ,        ,          
        *
        *   []      :
        *     :[0-9]    :0 9  (  )      
        *   [0-9]
        *   [a-z]             
        *                    
        *   [A-Z]
        *
        *                  
        *   [a-zA-Z]
        *
        *   [9]     9
        *   [o]o
        *                       
        *   [0-9a-zA-Z]
        *
        *   [0-9]  78
        *
        *
        *
        *
        *
        *   .    
         
        *   []   
        *   [0-9]0-9         
        *   [a-z]a-z           
        *   [A-Z]A-Z           
        *   [0-9a-zA-Z]               
        *
        *   [3-7]    3-7         
        *
        *   ()      (               ),     
        *
        *   |          
        *   [0-9]|[a-z]  0-9                        
        *
        *
        *   *                0      (  )
        *      : .*     
         
         *
         *   +                 1    (  )
          *  ?                 0  1 (    )
          *
          *
          *
          *
          *
          *
          *
         *
         *
        *
        *
        *
        *   {}       
        *
        *
        *
        *
        *
        *   .    
         
        *   []             
        *   *                  0    
        *   +                  1    
        *   ?                  0    
        *   ()                
        *   |        
        *
        *   {}                 ,      :       
        *
        *   [0-9]{0,}               0    
        *   [0-9]{0,1}              0  1 
        *   [0-9]{1,}               1    
        *   [a-z]{4}                4 
        *   [a-z]{5,10}              5  10 
        *
        *
        *             
        *
        *   \d               [0-9]  
        *   \D          
        *
        *   \s        
        *   \S         
        *
        *   \w        
        *   \W      
        *
        *
        *                     
        *
        *   ^:1.       ,       
        *     2.  
        *     :
        *   ^[0-9]          
        *   ^[a-z0-9]               
        *   ^[0-9a-zA-Z]             
        *   ^\d         
        *
        *   [^0-9]            
        *   [^0-9a-zA-Z]      
        *
        *   $ :         
        *   [0-9]$ "hsgd7y273d9"
        *   [a-zA-Z]$
        *
        *   ^[0-9a-z][a-z]$
        *
        *
        *
        *
        *
        *
        *
        *
        *
        *
        *
        *
        *
        *
        *
        * */