Certain custom rule regular expressions aren't parsed properly

[kutschenator]

Hi,
i am trying to add custom warnings in my yaml to match Void -> and -> ()
The first rule to match Void -> and Void-> works perfectly

custom_rules:
  void_as_parameter:
    included: "*.swift"
    name: "Void as Parameter"
    regex: "(Void ->)"
    message: "Use Void only as return type."
    severity: warning

but i cannot match -> () and ->()
i have tried (->[ ]?\(\)) and (\-\>[ ]?\(\)) but nothing works
Am I doing something wrong?

[jpsim]

Works for me. What version of SwiftLint do you have installed (swiftlint version)?

$ cat .swiftlint.yml 
custom_rules:
  void_as_parameter:
    included: "*.swift"
    name: "Void as Parameter"
    regex: "(Void ->)"
    message: "Use Void only as return type."
    severity: warning
$ cat main.swift 
let abc: Void -> () = {}
$ swiftlint
Loading configuration from '.swiftlint.yml'
Linting Swift files in current working directory
Linting 'main.swift' (1/1)
/working_dir/main.swift:1:10: warning: Void as Parameter Violation: Use Void only as return type. (void_as_parameter)
Done linting! Found 1 violation, 0 serious in 1 file.

[kutschenator]

Sorry i was not clear enough, the posted rule works but the one to match -> () does not.

➜  tmp cat .swiftlint.yml 
custom_rules:
  void_as_return:
    included: "*.swift"
    name: "Void as Parameter"
    regex: "(->[ ]?\(\))"
    message: "Use Void as return type instead of ()."
    severity: warning

➜  tmp cat test.swift 
let abc: () -> () = {}

➜  tmp swiftlint
Loading configuration from '.swiftlint.yml'
Linting Swift files in current working directory
Linting 'test.swift' (1/1)
Done linting! Found 0 violations, 0 serious in 1 file.

[jpsim]

Oops, no you were clear in your issue I just misread it. I can reproduce this, I suspect it's the way we're creating NSRegularExpressions for custom rules. I'll mark this as a bug and hopefully will have time to take a closer look later.

[kutschenator]

should I submit a rule for this once the issue is resolved?

[jpsim]

Yes please!