really good explanations and tips!!! Everyone now knows what they can / must focus on if they need this function. Your videos are not too long! They are detailed.
Informative & useful as always! For the bracket stuff, if you want to do infinite bracket and bracket rules this violates the pumping lemma so regexand you need a language of CNF or equivalent strength - although this is worth checking as a that might just be DFAs (but off the top of my head it is all regular languages) For this specitic case where you want just a single pair you can just do an or of (123) and 123
It's great how much you can learn in an afternoon of googling a new topic, but it's also good to have someone who actually knows what they're talking about to chip in now and again! 😂
@@DimEarly Re-reading this perhaps I should have proof-read it 😂 I've checked now and indeed regex is a regular language so due to the pumping lemma you can't have infinite matching brackets, but can get finitely many with lots of OR!
Great videos as ever, Dim. Concerning 9:55, we can do this drawing on the capture groups. I would go with: (\()?\d{3}(?(1)\))[- ]?\d{3}[- ]?\d{4} Very similar to yours - to break down the differences: (\()? - this the same as your \(? at the start, but turns it into capture group #1 so we can reference it later. (?(1)\)) - this says "If capture group #1 matched, we want a close bracket". You can get fancy with this with (?(group #) value if matched | value if not matched), but we don't want anything in the "not matched" condition, so it is left blank.
Nice! I've come across the concept of conditional replacement for capture groups (although that doesn't seem to be working in the Excel implementation at the moment), but I didn't know you could do the same thing for calling back to an earlier capture group within a pattern - very nifty! I just tested it out, and confirmed it matches the original test cases, and does not match a number formatted as xxx) xxx-xxxx. It does still match the number part of (xxx xxx-xxx ignoring the bracket, but that's probably the right answer (since that could be a phone number appearing at the start of a longer parenthetical, for example). P.S.: How did I never realize that you have a YT channel with esports videos?? I just watched your Othello video - it was an impressive run!
@@DimEarly @DimEarly I've not had a chance to play with the regex functions in excel yet - I'm not sure which standard they follow and which do or don't work. Yeah, it will match those (xxx xxxx patterns - I guess specifying start/end with ^and $ would solve for that. There are some super complex patterns you can do to check for proper pairings of opening and closing parentheses, but it's been a long time since I've played with those! I remember once playing with a json parser using regex...! Haha thanks, I did quite a few last year - I'm hoping to get back to posting videos soon, I definitely need some more practice before October!
really good explanations and tips!!! Everyone now knows what they can / must focus on if they need this function. Your videos are not too long! They are detailed.
I salute your attention span. 🫡 It’s a rare commodity these days.
Woah! We got a great presentation of these new functions! Thanks a lot that your videos!
That's caviar. Thank you!!!
Great point from ~1:30! If you don't understand regex you won't be able to realize what all it is capable of!
Got it! Extremely helpful. Thanks.
Thanks a lot for diving into and sharing!
Informative & useful as always!
For the bracket stuff, if you want to do infinite bracket and bracket rules this violates the pumping lemma so regexand you need a language of CNF or equivalent strength - although this is worth checking as a that might just be DFAs (but off the top of my head it is all regular languages)
For this specitic case where you want just a single pair you can just do an or of (123) and 123
It's great how much you can learn in an afternoon of googling a new topic, but it's also good to have someone who actually knows what they're talking about to chip in now and again! 😂
@@DimEarly Re-reading this perhaps I should have proof-read it 😂 I've checked now and indeed regex is a regular language so due to the pumping lemma you can't have infinite matching brackets, but can get finitely many with lots of OR!
Great videos as ever, Dim. Concerning 9:55, we can do this drawing on the capture groups. I would go with:
(\()?\d{3}(?(1)\))[- ]?\d{3}[- ]?\d{4}
Very similar to yours - to break down the differences:
(\()? - this the same as your \(? at the start, but turns it into capture group #1 so we can reference it later.
(?(1)\)) - this says "If capture group #1 matched, we want a close bracket". You can get fancy with this with (?(group #) value if matched | value if not matched), but we don't want anything in the "not matched" condition, so it is left blank.
Nice! I've come across the concept of conditional replacement for capture groups (although that doesn't seem to be working in the Excel implementation at the moment), but I didn't know you could do the same thing for calling back to an earlier capture group within a pattern - very nifty!
I just tested it out, and confirmed it matches the original test cases, and does not match a number formatted as xxx) xxx-xxxx. It does still match the number part of (xxx xxx-xxx ignoring the bracket, but that's probably the right answer (since that could be a phone number appearing at the start of a longer parenthetical, for example).
P.S.: How did I never realize that you have a YT channel with esports videos?? I just watched your Othello video - it was an impressive run!
@@DimEarly @DimEarly I've not had a chance to play with the regex functions in excel yet - I'm not sure which standard they follow and which do or don't work.
Yeah, it will match those (xxx xxxx patterns - I guess specifying start/end with ^and $ would solve for that. There are some super complex patterns you can do to check for proper pairings of opening and closing parentheses, but it's been a long time since I've played with those! I remember once playing with a json parser using regex...!
Haha thanks, I did quite a few last year - I'm hoping to get back to posting videos soon, I definitely need some more practice before October!
U r a treasure