How to filter records that have backslash in a field using x++?

Hi,

     I have a requirement to filter packingslip records that have backslash or no backslash in packingslipid. I could not able to filter the backslash records for the belwo code. Please let know how to filter backslash value as well no backslash value.

  this.query().dataSourceTable(tablenum(VendPackingSlipJour)).clearRanges();        

  this.query().dataSourceTable(tablenum(VendPackingSlipJour)).addRange(fieldnum(VendPackingSlipJour, PackingSlipId)).value(con2str(contPackingSlip)); 

 Thanks and Regards,

Kuppusamy S