message: cargo: add regex
diff: @@ -30,6 +30,7 @@ num-traits = "0.2"
  ordered-float = { version = "2.0", features = ["serde"] }
  prometheus = { version = "0.11", default-features = false }
  rand = "0.8"
  +regex = "1.4"
  reqwest = { version = "0.10", features = ["json"] }
  serde = { version = "1.0", features = ["derive"] }
  serde_json = "1.0"
  