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 function isDigit(s) {      
  var patrn=/^[0-9]{1,20}$/;      
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  return true      
 }      
    
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  var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/;      
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  if (!patrn.exec(s)) return false      
  return true      
 }      
    
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  if (!patrn.exec(s)) return false      
  return true      
 }      
    
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