The regex was @.*@ which will match anything between two @'s, including a command like:
`k3d cluster create --api-port 6550 -p '9080:80@loadbalancer' -p '9443:443@loadbalancer' --agents 2 --k3s-arg '--disable=traefik@server:*'`
The regex should be something that matches valid URL syntaxes.
Signed-off-by: Daniel Hawton <daniel.hawton@solo.io>