Use a pipe to generate only first word of a variable?

[Paul Kelleher <paul-JZTKsBFbLNkkm2bSNb+QWw@public.gmane.org>]

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Hello,

Is it possible to use a pipe in a template to generate just the first word 
of a variable? 

My specific use case is to produce just the first name of a first-and-last 
name that I place in the "to" field of a YAML block that passes info to a 
letter template. I'd like to generate "Dear <first name>,". To do this now, 
I've defined "to" as an array, with the first name as the first value of 
the array and the last name as the second value; then I can use the 
predefined 'first' pipe to return just the first name. But for reasons 
specific to my particular use case, it'd be great to have a pipe that 
returns the first word of a multi-word variable.

Thanks!

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