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LastIndexOf would search from the end of the string backwards. Otherwise, its functionality would be identical to the existing IndexOf function. It should also include Case Insensitivity, as the following link requests for IndexOf.

https://experience.dynamics.com/ideas/idea/?ideaid=f571e509-9fef-ea11-bf22-0003ff68cd76
Category: Development
STATUS DETAILS
Needs Votes
Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future.

Best regards,
Business Central Team