Fails to install: "Cloudflare configuration already exists"

[dansmithcode]

Following the installation instructions and running the install script, I get this error:

Cloudflare configuration already exists.

Examining the script, it seems to be a regex bug:

if ! grep -q "[Cloudflare]" "$CONF_FILE"; then
    echo -e "$STRING_TO_ADD" | sudo tee -a "$CONF_FILE" > /dev/null
else
    echo "Cloudflare configuration already exists."
fi

The regex string "[Cloudflare]" is a character class, matching every C, l, o, etc. Should be "\[Cloudflare\]".