Javascript and Regex tuning - striping string

Question

From the URL:

https://www.flightstats.com/v2/historical-flight/TP/1478/2020/11/3/1047614176

I need to get "2020/11/3"

WHAT I HAVE

The Regex:

\d\/(\d+\/\d+\/\d+)

it returns: for full match - "8/2020/1/3", for Group 1 - "2020/1/3". I've tested several combinations and tried to simplify it till this version

The Javascript:

var myRe = /\d\/(\d+\/\d+\/\d+)/;
var myArray = myRe.exec('${initialurl}');

Being initialurl a variable

PROBLEMS

The javascript returns: "8/2020/11/3,2020/11/3" and I only need/want the group 1 match or if the full match is correct, just that.

CONTEXT

Javascript newbie
I'm using this in Ui.Vision Kantu

If you're using a recent version of JavaScript you can use a lookbehind to match the first \d/ but not include it in the result. — Barmar
– Barmar, Commented Nov 5, 2020 at 17:34
@WashingtonGuedes Albeit it works, that's some woefully inefficient regex. Switch to PHP at regex101 and you'll see that it takes an absurd 2,622 steps to execute that; clocking in at 2ms on average. — MonkeyZeus
– MonkeyZeus, Commented Nov 5, 2020 at 18:20

MonkeyZeus · Accepted Answer · 2020-11-05 18:25:57Z

2

If your URLs are going to reliably be in the format shown then this would do it:

\d{4}\/\d{1,2}\/\d{1,2}

https://regex101.com/r/BqW2lr/1

var initialurl = 'https://www.flightstats.com/v2/historical-flight/TP/1478/2020/11/3/1047614176';
var myRe = /\d{4}\/\d{1,2}\/\d{1,2}/;
var myArray = myRe.exec(initialurl);

console.log(myArray);

edited Nov 5, 2020 at 18:25

answered Nov 5, 2020 at 18:12

MonkeyZeus

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3 Comments

user1128912 Over a year ago

Thank you. Worked like a charm. I had tested using "d{4}" but because sometimes the digits before are also 4, it didn't work as intended. I also tested using "d{2} | d{1}" for the month part since it can have 1 or 2 digits but it also didn't work 100%. With your help I've learned this: "d{1,2}".

MonkeyZeus Over a year ago

@user1128912 You're welcome. Like I mentioned in my answer, this regex is only useful if your URLs are expected to come through in that exact format. So if you have different types of expected URLs then you should add examples of them.

user1128912 Over a year ago

The URL structure is aslways as the one provided :)

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