How do I require a minimum version of zsh?

Question

I want to use a feature only present in newer versions of zsh: [[ "$foo" =~ "regexp" ]] where regexp is a regular expression.

Is it possible to do this check?

Something like:

if [[ $ZSH_VERSION > 4.3.9 ]]; then
   ....
fi

Except that > won't work.

Ciao!

Answer 1

I tried

if [[ $ZSH_VERSION > 4.3.8 ]]; then
  echo "YES"
fi;

and it worked. In my case $ZSH_VERSION has a value of 4.3.9, so I had to check for a different version.

Answer 2

I just found is-at-least but I'm not sure if it is available in all/many versions of zsh.

Usage:

autoload -U is-at-least
if is-at-least 4.3.9; then
   ....
fi

It's described in zshcontrib.

Ciao!