Fix my code, a badly formatted excel put into a listview in c# using regex

I am looking for a skilled developer to fix my poorly formatted excel code and implement regex in C#. The current issue with the code is formatting, specifically in the regex implementation. The desired output format for the fixed code is a list format.

Ideal skills and experience for this project include:
- Proficiency in C# and regex implementation
- Experience working with excel and listviews
- Strong attention to detail and ability to troubleshoot code
- Ability to deliver high-quality work within a tight deadline.

All the code is already written, you need to fix the regex so that I appear correctly in the listview