How to extract substring in Fish shell?

A possible solution is to use cut but, that look hackish:

set location "America/New_York"
echo $location|cut -d '/' -f1

America

Since fish 2.3.0, there's a builtin called string that has several subcommands including replace, so you'll be able to do

string replace -r "/.*" "" -- $location

set location (string split "/" -- $location)[1]

See http://fishshell.com/docs/current/commands.html#string.

Alternatively, external tools like cut, sed or awk all work as well.

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