rm -f *.[eo]** Of course if you have file with e or o after dot it will be delete too. In this situation you can upgrade command to
rm -f *.[eo][0-9]*. However, if can fail too if there is number after o or e letter ;). But It's rather unusual situation. You can add this line to your .bashrc file:
alias pbsdel="rm -f *.[eo][0-9]". Now you can use pbsdel to deleting pbs file.