Text Processing - Cut Document - Similar entries separated by a number

I was having trouble finding the operator documentation that pertains to string matching or cutting documents in general.

I have a few different types of documents (.xml, .csv, .docx, .html) that list records, in order, separated by *Record (n)* in ascending numbers, starting with 1.

Each of these records has similar attributes but it's all unformatted other than the records and attributes being separated by asterisks*.

My hope was to cut the document by record, which I assumed I could do with a string matching query, but I'm not sure how I could do that if each record is different, and the only commonality being the record #, but that's variable so not sure how to input that expression.