assembly - NASM check if input is a double digit number without a specific Ascii value like "00" -

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I am trying to figure out that the user is input 00 but I do not know How to check that I can check numbers or letters that have a specific ESI value such as: 

  cmp byte [buff], 39h jbe aMethod  < / Pre> 
  buff  is where the user input is stored.  
 I check each byte like  00  such as   
 
  
  CMP byte [buff], 30h jne not_00 cmp byte [buff + 1], 30h jne not_00 is_00: ... not_00: ...

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