Regex, one occurrence between two differents delimiters

Question

I'd like to have a regex which select everything between the not-included characters delimiters ``` and I . I only want the first occurrence.

Here is my wrong try (very new to regex) :

(^`)[\s\S](I$)?

Answer 1

/(?<=`).*?(?=I)/s

This regex will look for a backtick, but not include it. Then it will match anything it can, up to the first I character.

The difference between this answer and @vks's answer is that mine will require there to be an ending delimiter.