How to use regular expressions to select all lines that are missing a certain word?

Question

Regular Expressions

Actually, if a certain list of lines is in the format:
строка значение
One from the other is separated by a tab.
You need to remove all lines that do not contain a specific pattern in the regular expression.
I have heard a lot about (?!:...) and others like it, but no matter how I try to prescribe them, it does not give a result.

Answer 1

Hold on:
https://regex101.com/r/bim45f/4
and even more accurate
https://regex101.com/r/bim45f/5