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 function isDigit(s) {      
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  if (!patrn.exec(s)) return false      
  return true      
 }      
    
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  if (!patrn.exec(s)) return false      
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  if (!patrn.exec(s)) return false      
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 function isPasswd(s){      
  var patrn=/^(\w){6,20}$/;      
  if (!patrn.exec(s)) return false      
  return true      
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