Regex in Codebuild pipeline

I'm looking for some small help with regex in my Codebuild pipeline. The language I'm using is Bash, as well as Codebuild. I need help specifically locating syntax errors, but I may also need a bit of guidance and help setting it up. Thankfully, the complexity of the code isn't too tough; it's quite simple. I'm hoping to find the right person who can help me quickly and efficiently in this project.