CODEWITHSUNDEEP
javascript
Fred J.
Fred J.

Reputation: 6029

Extract the first word after a given string in a variable

Given a sentence the description is about fast cars. And a string str = description is, How can i get the word "about"?

I tried some look behind regex but could not come up with a elegant way. Any suggestion other then use the indexOf few times along with split an splice? thx

    let re = new RegExp('(?<=' + str + ').*');
    let result = mySentence.match(re)[0].split(' ')[0];

edit
I forgot to add that str match should be case insensitive.

Upvotes: 0

Views: 1088

Answers (3)

Sventies
Sventies

Reputation: 2756

Try this:

var sentence = "the description is about fast cars";
var word = "description is";

function getFirstAfterSplitSentence(sentence, word) {
  return sentence.split(word)[1].split(" ")[1];
}

console.log(getFirstAfterSplitSentence(sentence, "is"));

Upvotes: 0

Diego
Diego

Reputation: 816

A general approach would be:

const orig = 'the description is about fast cars';
const str = 'description is';

const result = orig.split(str).pop().trim().split(' ').shift();
console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 0

baao
baao

Reputation: 73241

There's no need for a lookahead.

let s = "the description is about fast cars"
let f = "description is";

let r = new RegExp(f + "\\s(\\w+)");
console.log(s.match(r)[1]);

Upvotes: 2

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