Hello, I am trying to use regexp-example but I have an irregular expression and it says that the gem is not compatible with looking back and looking forward, can you help me? is there any solution or do I have to modify the regex? about regexp-examples HOT 4 CLOSED

So it would be possible to re-structure that regex to make it genuinely regular - and therefore leverage this gem - but it's up to you whether you'd like to restructure it...

This:

(?!0{2})[0-9]{2}

Could be written as:

([0-9][1-9]|[1-9][0-9])

And this:

[TV] ((?<=[T])[X-Z]|(?<=[V])[A-HJ-NPR-Z])

(Won't actually work as you expect, since there's an extra space, but) could be written as:

(T[X-Z]|V[A-HJ-NPR-Z])

...and voila, the regex is regular!

Final result:

/^([0-9][1-9]|[1-9][0-9]) (T[X-Z]|V[A-HJ-NPR-Z])[1-9][A-HJ-NPR-Z]$/.random_example
# => "50 VV6R"

Magic 😄

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Hi @anderstroker. It's hard to give advice without seeing a concrete example of your use case. Could you share it?

As I've stated in the README, and explained in more detail in a blog post, "irregular" aspects of regex (such as lookarounds) cannot be supported by this library's algorithm.

Perhaps there is a different way to construct the regex, without lookarounds; or perhaps this library isn't a good fit for your problem.

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Oh shure, let me show you, I am building a project that through the license plates validate to which entity they belong, type of vehicle, and other things, I use the gem to give me all the combinations of the regex, I built an example for trailers.
(?!0{2}) this ignore 00,just 01 to 99
[TV] ((?<=[T])[X-Z]|(?<=[V])[A-HJ-NPR-Z]) this depending behing character

^(?!0{2})[0-9]{2} [TV] ((?<=[T])[X-Z]|(?<=[V])[A-HJ-NPR-Z])[1-9][A-HJ-NPR-Z]$

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Thank you so much, my friend... I will try

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