CODEWITHSUNDEEP
javascript
ave
ave

Reputation: 19523

Extract substring by regex

I'm trying to extract a resource id using regex into a variable.

So far I managed to match the string, but I'm confused as to how to extract the digits into a separate value.

"/posts/23/edit".match(/\/posts\/(\d*)\/edit/g)
// => ["/posts/23/edit"]

Upvotes: 1

Views: 5624

Answers (2)

Oriol
Oriol

Reputation: 288620

That's because you use the g (global) flag, which makes match ignore capturing groups.

If you are only interested in the first match, just remove the flag.

console.log("/posts/23/edit".match(/\/posts\/(\d*)\/edit/));
// [ "/posts/23/edit", "23" ]

Otherwise you should keep the flag and repeatedly call exec inside a loop.

var match, rg = /posts\/(\d*)\/edit/g;
while(match = rg.exec("/posts/23/edit -- /posts/24/edit")) {
  console.log(match);
}

Upvotes: 2

Tomalak
Tomalak

Reputation: 338376

/\/posts\/(\d*)\/edit/g.exec("/posts/23/edit")
// => ["/posts/23/edit", "23"]

Upvotes: 2

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