CFLib.org – Common Function Library Project

Description:
Returns True if the specified value and verifying digit constitute a valid RUT (government company number used by Chile). RUT numbers appear in the form xx.xxx.xxx-y or x.xxx.xxx-y where x represents digits 0-9 and y represents the verifying digit in the form 0-9|K.

Return Values:
Returns a Boolean.

Example:

<CFSET RUT="13.623.479-K">
<CFSET NUT="12.345.678-0">
<CFOUTPUT>
Is #RUT# a valid RUT? #YesNoFormat(IsRut(RUT))#<BR>
Is #NUT# a valid RUT? #YesNoFormat(IsRut(NUT))#<BR>
</CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns True if the specified value and verifying digit constitute a valid RUT (government company number used in Chile).
 * 
 * @param rut      RUT you want to verify. 
 * @return Returns a Boolean. 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1, January 9, 2002 
 */
function isrut(rut) {
  var dig=right(rut,1);
  var largo=0;
  var suma=0;
  var factor=2;
  var digito=0;
  var i=0;
  var valor="";
  rut=ReplaceList(rut, ".,-", "");
  rut=Left(Rut, Len(Rut)-1);
  if (isNumeric(rut)){
    largo=len(rut);
    for (i=largo;  i gte 1; i=i-1){
      if (factor gt 7) {
        factor=2;
      }
      suma = suma + factor * int(mid(rut,i,1));
      factor = factor + 1;
    }

    digito = 11 - (suma mod 11);
    switch(digito) {
      case 10: {
        valor = "K";
        break;
      }
      case 11: {
        valor = "0";
        break;
      }    
      default: {
        valor = digito;
        break;
      }
    }

    if (Ucase(valor) eq Ucase(dig)){
      return true;
    }
    else {
      return false;
    }
  }
  else {
    return false;
  }
}