How do I make a pre-receive hook for Scriptrunner

[Margaria Vince]

Hello, I am trying to make a pre-hook using Scriptrunner in Bitbucket. The hook is supposed to check if there is a file named "conanfile.py" whenever a user push, if there is not nothing happens but if there is, the hook check what's inside and compare it with a regex I made. The problem I have is that I can't seems to make it find the file. Here is the code of the hook in groovy :

def regex = ".*requires\\(\"[^\\d|_|\\-](\\S)+/\\[(\\d)(\\.\\d)*\\]@(eca|exail)/stable\""

def fileName = "conanfile.py"

def file = new File(fileName)

if (file.exists()) {

  file.readLines().each { line ->

    if (line.startsWith("self.requires")) {

      if (!(line =~ regex)) {

        log.error("Lorem Ipsum $line")

        return false

      }

    }

  }

  log.info("All 'self.requires' lines match the regex.")

  return true

} else {

  return true

}

The code compile but it always says that my file is not existing. Anyone got some tips to help me please ?