.git_hooks_commit-msg

#!/bin/bash
commit_regex='^\[(GM\w-[0-9]+|HotFix\-[0-9]{4}\/[0-9]{2}\/[0-9]{2})\]\s\w*\s-\s'
error_msg="Aborting commit. Your commit message is incomplete.\r\nPlease include the following:\r\n\t - a JIRA Issue number or a HotFix-date\r\n\t - a component label\r\n\t - a summary of what was changed"

if [[ $(cat "$1" | grep -icE "$commit_regex") -eq 0 ]]; then
    echo $(cat "$1" | grep -icE "$commit_regex")
    printf "$error_msg" >&2
    exit 1
fi