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Is something like this possible with fish? i.e.

switch $var case a-z do something case "*" do something else end

case "*"works fine, but case a-zdoesn't trigger. I also tried case [ a-z ] but no joy.

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The fish shell has not, for some reason, implemented character sets. Assuming you're using the latest version, use the string command

if string match --quiet --regex '[a-z]' $var >/dev/null echo $var contains a letter else echo $var has no letters end

I'm using regex matching due to the minimal glob patterns in fish

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