Check for branch name with Regex

deploy_if.sh

#!/bin/bash

echo $COMMIT_BRANCH | grep -E "^(\d\.?)+$" > /dev/null

match_result=$?

if [ "$match_result" -eq "0" ]
then
  # Exit if any command fails only when the deployment runs 
  set -e
  echo MATCH
  # Run commands if match
else
 echo No Match
 # Add message that there was no match
fi