"Invalid value" error when start Pipelines from web console and username has special character like "@" in OpenShift 4

Issue

• Why am I unable to start pipelines from web console when the username is in the form of email address?

• When starting a pipeline from OpenShift Container Platform web console with the user that has a special character, like @, in the name will result in this error:

  Error "Invalid value: "username@domain.com": a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue', or 'my_value', or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')" for field "metadata.labels".