regex - mysql stored procedure regexp -

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I try to check my authentication with a regexp but there is always an error 

  BEGIN declared closelyn varchar (255); If POST_FARMS is zero, set the closolin = 1; Otherwise if POST_FARMS REGEXP '^ [1- 9]' then set the closolin = 2; ELSE set closolar = 3; end if; Select clogolin; END    
 
 
 Please study this link thoroughly:  
 
  13.6.5.2 If the syntax  - If search is a statement then the list [ ELSEIF  search_condition then statement_list] ... a [ELSE statement_list] / END if   
 And then please compare the above syntax with your code:  
 
  ELSE if  is a POST_FARMS REGEXP ^ ^ [1 - 9] 'THEN

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