mysql - Is there a way to find a last substring? -

My brain may be really tired but I do not have to work on my head about this simple query. I want to remove a final substrings within the delimiter such as ',' from a column? I was thinking about using reverse or right .. but the results are being queued very oddly ...

Let's say I have a table column 'DESCRIPTION' in which There is a table law with entry "IT-X130E-10" from "IT-X130E-9" to converted laptop

and I final Substring want

  IT-X130E-9   
 The '' 'within the delimiter is expected to clear it now   
 
 
 can try  
  SELECT SUBSTRING_INDEX (SUBSTRING_INDEX ('yourString', '' ', -2),' '', 1);