I used this years AoC to learn rust and had similar issues with input parsing. I found a fairly simple parsing crate (https://docs.rs/scan-rules/0.2.0/scan_rule

I used this years AoC to learn rust and had similar issues with input parsing. I found a fairly simple parsing crate (https://docs.rs/scan-rules/0.2.0/scan_rules/ https://docs.rs/scan-rules/0.2.0/scan_rules/) which helped a lot with the simpler inputs (day 24 was still a pain). It pretty much exactly matches the format you described.