What is wrong with this hook? - groovy

Question

I am currently working on Scriptrunner for bitbucket. I made a pre-receive hook that check the push, if there is a file named "conanfile.py" it checks the inside of the file and compare it with a regex I made. My problem is that whenever I try to push to test this, my terminal tells me there is a mistake :
Total 13 (delta 8), reused 0 (delta 0), pack-reused 0
remote: Push blocked
remote: Conanfile.py lines starting with "self.requires" should match regex
To https://bitbucket.ecatools.io/scm/ttdo/test_branch.git
! [remote rejected] testscript -> testscript (pre-receive hook declined)
While Scriptrunner tells me that everything is fine :
I am quite lost at what to do and I am here asking for help please.
I tried several ways of doing this while learning Groovy, here is the code of the pre-receive hook (i deleted the import to not take too much space, tell me if you need them) :
#ShortTextInput(label = 'regex', description = 'Regex expression used to verify file content')
String regexValue
def pattern = Pattern.compile(".*requires\\(\"[^\\d|_|\\-](\\S)+/\\[(\\d)(\\.\\d)*\\]#(xxx|xxxxx)/stable\"")
def commitService = ComponentLocator.getComponent(CommitService)
def contentService = ComponentLocator.getComponent(ContentService)
def commits = refChanges.getCommits(repository) as List<Commit>
// filePaths to commit Id, if file was modified in multiple commits, take the last commit id
def filePaths = [:] as Map<String, String>
commits.reverseEach { commit ->
def changesRequest = new ChangesRequest.Builder(repository, commit.id).build()
commitService.streamChanges(changesRequest) { Change change ->
if (change.path.toString().endsWith("conanfile.py")) {
filePaths[change.path.toString()] = commit.id
}
true
}
}
def result = filePaths.keySet().collect { filePath ->
def fileStream = new ByteArrayOutputStream()
contentService.streamFile(repository, filePaths[filePath], filePath) {
fileStream
}
fileStream.toString()
}.every {
it.split("\n").any { line ->
line.startsWith("self.requires") && pattern.matcher(line).find()
}
}
result ? RepositoryHookResult.accepted('push approved') : RepositoryHookResult.rejected('Push blocked', 'Conanfile.py lines starting with "self.requires" should match regex')