check a range with switch/case in fish shell

Question

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.

Answer 1

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