solve day 6 and 7

Cargo.lock

@@ -26,6 +26,7 @@ dependencies = [
  "itertools",
  "pico-args",
  "regex",
+ "regex-split",
  "tinyjson",
 ]
 
@@ -352,6 +353,15 @@ dependencies = [
  "regex-syntax",
 ]
 
+[[package]]
+name = "regex-split"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "544861d1810a3e429bb5e80266e537138b0e69e59bed9334326ae129a4c3e676"
+dependencies = [
+ "regex",
+]
+
 [[package]]
 name = "regex-syntax"
 version = "0.8.8"