message: fix(CI): switch to linux supported regex flag
diff: . ~/.bashrc
  -echo 'Current Branch: ' $CIRCLE_BRANCH
  +echo 'Current Branch: ' "$CIRCLE_BRANCH"
  # Demos will only deploy when merging to one of these branches:
  releaseBranches=("release")
  @@ -17,20 +17,21 @@ releaseBranches=("release")
  if [[ " ${releaseBranches[@]} " =~ " ${CIRCLE_BRANCH} " ]]; then
  # Clone the demo repo
  - cd $HOME
  - git clone git@github.com:GetTerminus/ui-demos-$CIRCLE_BRANCH.git
  + cd "$HOME" || exit
  + git clone git@github.com:GetTerminus/ui-demos-"$CIRCLE_BRANCH".git
  # Enter the demos repo
  - cd ui-demos-$CIRCLE_BRANCH
  + cd ui-demos-"$CIRCLE_BRANCH" || exit
  # Remove old demo files
  - find -E . -regex '.*\.(html|css|js)' -type f -delete
  + echo "Deleting old demo files:"
  + find . -regextype posix-extended -regex '.*\.(html|css|js)' -type f -delete
  # Move new files into the cloned repo
  - mv -f -v $HOME/ci-build/dist/app/* $HOME/ui-demos-$CIRCLE_BRANCH/
  + mv -f -v "$HOME"/ci-build/dist/app/* "$HOME"/ui-demos-"$CIRCLE_BRANCH"/
  # Clone the index.html file as 404.html to support deep linking
  - cp $HOME/ui-demos-$CIRCLE_BRANCH/index.html $HOME/ui-demos-$CIRCLE_BRANCH/404.html
  + cp "$HOME"/ui-demos-"$CIRCLE_BRANCH"/index.html "$HOME"/ui-demos-"$CIRCLE_BRANCH"/404.html
  # Update git credentials
  git config credential.helper 'cache --timeout=120'
  