Regex only match parts of a string where words not ending with

Here is my string

 something_a12345678901234567890123 something_else_a12345678901234567890123 hello my_dude

I’d like to catch only

 hello my_dude

In short, every bit (where a bit is separated by space) not ending with

 _[a-z0-9]{24}

Here is my regex

 /[a-zA-Z0-9\\-_]+(?<!_[a-z0-9]{24})/g

But it’s catching almost everything…

>Solution :

Add word boundaries:

\b[\w-]+(?<!_[a-z0-9]{24})\b

See live demo.

Note simplification of regex too.