alternation option end of string

Ray Andrews <[email protected]> Fri, 1 May 2026 15:31:18 -0700

Newsgroups	gmane.comp.shells.zsh.devel,gmane.comp.shells.zsh.user
Message-ID	<[email protected]>

I know how to do an alternation, but how do you make one of the choices 
'nothing' meaning end of string?

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