Given this dbt_project.

The true root cause is not related to run hooks or regular expressions. The warning clearly indicates that dbt found a configuration path that does not match any actual model path inside the project. In this case, the config block uses the key models.jaffle-shop, which is incorrect because dbt model paths must match the folder structure and cannot contain hyphens unless the folder itself contains a hyphen. Since the project folder is named jaffle_shop (with an underscore), dbt cannot map the configuration to any model.

dbt evaluates configuration paths based on directory names under the models/ folder. A mismatch between the folder name and the configuration key causes dbt to ignore the configuration entirely. This results in the warning:

“Configuration paths exist in your dbt_project.yml file which do not apply to any resources.”

This warning is specifically triggered when dbt identifies unused configuration paths due to typos, incorrect nesting, or invalid identifiers. dbt does not interpret hyphens (-) as valid Python identifiers for resource names, so a config path like models.jaffle-shop will never be applied.

Therefore, the assertion that the cause is a "run hook with an incorrect regular expression" is incorrect. The actual root cause is that the configuration path uses the wrong name (jaffle-shop instead of jaffle_shop).