How do I debug hooks created with ScriptRunner?

[Esther Strom]

I added a pre-receive hook using the Protect Git Refs type, following the condition described in the accepted answer here.

Condition:

def commits = refChanges.getCommits(repository)

def regex = "[A-Z]{2,9}-\\d+\\s[A-Za-z]+.*"

commits*.message.any { message ->
   	!(message  ==~ /${regex}/)
}

First, the script editor in ScriptRunner gives me an error on the commits.message line, saying "expecting '}', found '-' @ line 5, column 32." I copied and pasted the condition directly from the linked answer, so I'm not sure if it's actually supposed to be a greater-than symbol that got translated or what.  But it did let me save, so I tried to push a commit, and got this message in my git bash window:

"remote: A pre-receive hook failed to execute properly - contact an Administrator"

So my question is, how do I go about debugging issues with hooks created via ScriptRunner? Is there a log somewhere?

(EDIT: I changed it to an actual greater-than symbol, and it works now. But I'd still like to know how to debug hooks.)

Also - is there a way to add line breaks to the error message? What I get in git now is this:

remote:
remote: =====================================================
remote: Your commit message must start with a Jira number. Use git commit --amend to update your commit message. (<esc> :wq <enter> to get out of Vim)
remote: =====================================================
remote:

I'd like to get something like this:

remote:
remote: =====================================================
remote: Your commit message must start with a Jira number.

Use git commit --amend to update your commit message.

Then type (<esc> :wq <enter> to get out of Vim)
remote: =====================================================
remote:

[Daniel Yelamos [Adaptavist]]

Hi Esther.

What do you mean you want to debug hooks?

Do you debug any other SR feature? If so how?

The word "debug" is quite broadly used, and I want to be 100% sure I know what you mean before I commit to an answer.

Cheers!

Dyelamos