Could you check the workflow provided in the below post :
If the PDF has a Simpler table, this workflow should be able to extract and save it in Excel. This might not work for all types of PDF.
However, Do try this and let us know if you get any errors.
Also, for the regex method extraction, we would require a Sample PDF or the exracted text to check further the patterns, analyse and provide a better solution. You could also research on the regex part as there are many tutorials available in the Forum :