How to create a normalization rule and process which will remove an erroneous string “|a” from the 035 field

Question: In our institution several bibliographic records were uploaded with an erroneous string “|a” in the 035 field. For example we have this 035 field: $$a (OCoLC)|a43694461 $$9 ExL which should be $$a (OCoLC)43694461 $$9 ExL Answer: ONE Create the normalization rule with correct syntax.