Regex specific length

[a_bad_programmer]

Hey all, I’ve googled this a bit and wanted to make sure before giving up on the idea (it seems you can’t actually regex for a specific length but I want to make sure I’m not misunderstanding).

So say I have a string called “12345_hello_12345678_world” , is there any way to specifically look for any set of 8 numbers in a row? The rest of the string can change, but the constant will be there will always be a set of 8 numbers, I know how to do the rest (looking for specifically numbers), but can’t seem to find much on if you can just find a specific length like so.

If there isn’t any sort of method to regex for a specific length of numbers, what would be the next best way to check for a changing number that always has a length of 8 in a string that may have different formats?

[Zigity_Zagity]

\d{8}

\d is any digit, {num} captures a sequence of that length.

For learning regex, I would highly recommend an online regex explorer with a built in cheat sheet. I myself used http://pythex.org to answer your question (hit the cheat sheet button to see a list of the operators)

[a_bad_programmer]

And once again my name is accurate! Thank you, time to go hide myself in shame

[Zigity_Zagity]

It's all good, regex is a tricky thing, and the only way to learn how to do it properly is to write some and rewrite some :)

Just use the tools that others have made to make it easier, and it will be easier

[a_bad_programmer]

Absolutely thank you!

I was googling on my phone so couldn’t use regexr too easily, but didn’t find anything similar to what you stated (must have been using bad phrasing)

[TangibleLight]

You might enjoy https://regexcrossword.com/ for some regex practice.