Pauses have nothing to do with Regex.
The current Regex:
auth-sender:\h+(.+)\h*\R*
will match "auth-sender:" and then ONE or more spaces or tabs.
Change it to this to allow ZERO or more:
auth-sender:\h*(.+)\h*\R*
In the future when you post source text, please use the Forum Code Block with a language of "text".