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Regular expression that matches regular expressions

Has anyone ever tried to describe a regular expression that matches regular expressions?

This question is almost impossible to find on the Internet due to duplicate keywords.

It is probably not applicable in real applications, because languages ​​that support regular expressions usually have a method for parsing them, which we can use for testing, and a method for distinguishing regular expressions in code that can be used for searching.

But still, I wonder what the regular expression looks like, matching all regular expressions. It should be possible to write one.

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2 answers

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^([igsmx]{1,})?\/(?=.*?(\\w|\\d|\[.*?\]|\(.*?\))).*?\/([igsmx]{1,})?$

, looooooot...

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Source: https://habr.com/ru/post/1537141/

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