Handle errors from regexp

[thepetk]

What does this PR do?

Replaces the regexp.MustCompile with regexp.Compile in case we provide a var and not a fixed/hardcoded value. This way it ensures that we will be able to catch any errors from regexp.

Example Replace:

re, err := regexp.MustCompile(regex)

With:

re, err := regexp.Compile(regex)
if err != nil {
   return ""
}

Which issue(s) this PR fixes:

Fixes #199

[yangcao77]

confirmed that the issue has been fixed with this change.
can we add any test cases for this issue?

[thepetk]

confirmed that the issue has been fixed with this change. can we add any test cases for this issue?

I want to add the same project which we have faced the issue.

[thepetk]

@yangcao77 I've added an extra test case in alizer-test-resources -> this PR and I have updated the already existing PR for tests update

So this way we can merge the current workaround which will unblock HAS and this specific test case will be added with the next merge.

[yangcao77]

/lgtm