Tell us what’s happening: Hey fellow code campers - I have the correct code but I used a line from the example that I don’t quite understand. Can anyone explain: (?=\D*\d\d) Basically this look ahead looks for at least one number. \D* - looks for not a number, any amount,. \d\d - then looks…

Please check following thread, includes explanation. [image] Positive and Negative Lookahead JavaScript Tell us what’s happening: This code does not pass the test cases of “bana12” and “abc123” and I don’t know why… Your code so far let sampleWord = "astronaut"; let p…

The important thing to take away about the lookahead is that it finds it but does not include it in a match it’s necessary to be there for a match to occur, but isn’t included in a match So you can use the positive lookahead to look ahead and see if there’s two consecutive digits, and then in the …

Interesting. Ok so this is basically adjusting the search to look anywhere instead of only a specific place.

Yes that’s right, else the lookahead would only check the current position being searched

mySolution… Does it contains atleast 5 alpha-numeric char or non numeric 3 times and atleast one numeric… let sampleWord = "astronaut"; let pwRegex = /(?=\w{5,})(?=\D{3,}\d)/; // Change this line let result = pwRegex.test(sampleWord);

[image] wakeUpSid: /(?=\w{5,})(?=\D{3,}\d)/ Please not your pattern would pass the test, but it’s wrong since it matches “bana1a” which shouldn’t. Or should match “JB007” which id doesn’t. Please mind the two consecutive digits dear. Also mind the digit could be at middle too.

Thanks for your reply. Ill concentrate on the little things.

let pwRegex = /(?=\w{5,})(?=\D*\d{2})/; Is these correct one.

One small note is the challenge needs the string should be greater than 5, so equals or greater than 6, so this is the first thing you may consider dear. Also note about the second group (?=\D*\d{2}), it’s wrong becasue you supposed to have both \D*\d{2} together, so make them as a group, so you ha…

What baffled me for a few minutes is that these lookahead expressions are using the whole string all the time (well unless there’s a boundary set like ^ or $ or \b, etc…) so first I thought I need to check for the 5 char req. then the 2 digits, after each other, and it did not occur to me that both …

Positive and Negative Lookahead - further explanation

Curriculum Help

anon18662199 July 9, 2018, 8:48pm 2

Please check following thread, includes explanation.

Happy coding

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Positive and Negative Lookahead - further explanation

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