regex lookbehind if matches exclude entire lane

Question

I am trying to match single character ] only if [! is not ahead.

Regex:

(?!(?:\[\!.*))\]

Expected Result:

_dynamic_text_[!_dynamic_text_]_dynamic_text_

_dynamic_text__dynamic_text_]_dynamic_text_
                            ↑

Current Result

_dynamic_text_[!_dynamic_text_]_dynamic_text_
                              ↑
_dynamic_text__dynamic_text_]_dynamic_text_
                            ↑

https://regex101.com/r/IIzoX5/1

I have consulted several reference sources, but I am still encountering difficulties in finding out how to accomplish this task.

Would you be able to offer me some guidance or advice?

Answer 1

You may use this regex:

^(?!.*\[!)[^]\n]*]

RegEx Demo

RegEx Details:

• ^: Start
• (?!.*\[!): Make sure we don't have [! anywhere till end
• [^]\n]*: Match 0 or more of any character that is not ] and not a line break
• ]: Match a ]