regex error is useless

[jonthegeek]

# Try to check a url.
stbl::stabilize_chr_scalar(
  "not a url",
  regex = "http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+"
)
#> Error:
#> ! `"not a url"` must match the provided regex pattern.
#> ✖ Some values do not match.
#> • Locations: 1

^{Created on 2023-08-25 with reprex v2.0.2}

At a minimum we should show the regex pattern. Somewhere in the hierarchy we should allow the user to provide a better definition of the object they're asking us to validate, probably (cuz "must be a url" would be way clearer).