[eru]

> You might not be able to avoid using your standard lib's regex, or your project's chosen regex dependency - based on team/company policy. So it's not as simple as "use a regex engine that doesn't has this flaw".

Well, yes, if someone forces you to use tools that have flaws, you need to learn about the flaws so you can work around them. Like when using a shoe as a hammer.

I'm not sure that proves anything about abstractions?

See also https://blog.codinghorror.com/the-php-singularity/

> Because there are tons of factors that can affect your regex experience with unicode, normalization, different lower/upper case treatment, composite characters that don't match even though it looks like you typed the same character in your query, handling new unicode characters (ASCII 7/8 bit has been fixed for decades) and so on.

Thanks.