Can anybody explain why my regex does’t work in the example below? [image] I tried modifying it and reached the desired effect but I still don’t get why the regex in the first picture doesn’t do the same as the second one? [image]

There is an implied and between those two look arounds. Your first regular expression is trying to find a place in that string where it is immediately followed by text that will satisfy both of those look around

@TomSssM , in the first example you don’t really do a match at all. You basically do 2 lookaheads: Check if the string consists of at least 5 \w characters: returns true Check if the string consists of at least 2 \d characters: returns false as there are not only \d characters in the string I wou…

Uhm…so, you do not have a lookahead of a lookahead but a single lookahead condition composed by those two? :open_mouth: It means that the \D* could be replaced in this case by a \w{3} for example right? But i have one doubt: x(?=y) Matches x only if x is followed by y . For example, / Jack(?…

I get it now) Thanks) I also tried doing the same except with \D instead of \w

I am not sure if I know 100% why. The way I see this is like an if statement in if’s because there is no other character but lookarounds. For example, if you write /10(?=px)/ it will only match 10 if it is immediately followed by"px". But!!! If you write /(?=px)/. There is nothing before the looka…

[image] Question about Regex JavaScript I’m no regex wiz but I’ll give this a shot to the best of my understanding. /(?=\w{5,})(?=\d)/ Your second lookahead is trying to match a place in your string where a pointer could be placed such that the pointer is immediately fol…

Oh my God, I just now, for the first time, realized that astron22aut passes only because it ends in “22aut”. Thank you so much sir)))

Little late on this. A sequence of consecutive look arounds operate at the same character position. The two lookaheads therefore overlap. Since \d is a subset of \w, they can be combined as such: (?=\d{2}\w{3}) which is the factored version and is much faster. This checks a total of 5 required…

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alhazen1 October 19, 2018, 6:25pm 7

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Confusion with regex lookaheads	2	659	April 7, 2019

I need a RegEx Guru!

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