[recfmt] clarification request re: string manipulation in templates

[Matthew Graybosch]

I have a question regarding section 14.1 of the recutils manual (located at 
<https://www.gnu.org/software/recutils/manual/Templates.html>). At the end it 
says, "You can use any selection expression in the slots, including 
conditionals and string concatenation.”

Can anybody point me to documentation explaining how to apply selection 
expressions to recfmt template slots? I’m particularly interested in substrings 
at the moment; given a date like "2022-04-29T23:15:03-04:00” I’d like to 
retrieve the first ten characters for a result of “2022-04-29”.

Thanks.

—
Matthew Graybosch
https://matthewgraybosch.com
“Even in the future nothing works.”
#include <disclaimer.h>

#include <disclaimer.h>