Search all parts of a combined text field and delete parts that contain a certain string

Is there a way to search all parts in a combined text field, and then delete the entire part based off conditions? I can't use filters on my summary field, so I need to do this once the combined text field has been looked up a few times. I can think of ways to do it if I check each part, and simply repeat the code for the max # of parts I anticipate having, but was wondering if there is a sneaky way to do it without breaking it into individual parts. I'm thinking of searching and replacing everything after a certain text string, until the next semicolon, perhaps?​

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Mike Tamoush
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