Is it really though? There are tons of characters you can add to a regex that have difficult if not impossible to mentally comprehend impacts on the potential matches. That's why you need 100 test cases for every 10 characters you write in a regex. Regex itself could all be a footgun by this standard. No one in the history of no one has ever thought "why dont I just add a random character to my regex I don't need or understand" that's just boogie man level irrational fear if you think this has any bearing on the ease of use of ruby.