CODEWITHSUNDEEP
javascriptregexstringsubstring
johnchar
johnchar

Reputation: 547

Extract a word in a dynamic string

In this example, I want to extract the given price in the string.

const string = 'I am a long sentence! My price is $5,000 on a discount!';
const price = string.substring(string.lastIndexOf("$")+1,string.lastIndexOf(" "));
document.write(price);

The above method won't work because it selects the last index of a space (" ")

How do I go about getting the space right after the price ?

EDIT:

The string might be anything else! I have no control over it, I just want to extract the price. In case I didn't make that clear.

Upvotes: 0

Views: 673

Answers (6)

LellisMoon
LellisMoon

Reputation: 5020

const string = 'I am a long sentence! My price is $5,000 on a discount!';
    const price =string.split('$')[1]//text after $
             .split(' ')[0];// text after $ and before space
    document.write(price);


const string = 'I am a long sentence! My price is $5,000 on a discount!';
const price =string.split('$')[1].split(' ')[0];
document.write(price);

or

const string = 'I am a long sentence! My price is $5,000 on a discount!';
    const price =string.match(/\$[0-9]*,[0-9]*/);
//match $XXX,XXX in the string and estract it
    document.write(price);

Upvotes: 2

Ruslan Osmanov
Ruslan Osmanov

Reputation: 21502

const string = 'I am a long sentence! My price is $5,000 on a discount!' +
  'Another price: $120.';

var m = string.match(/\$[\d,]+/g);
var i, price;
if (m) {
  for (i = 0; i < m.length; i++) {
    price = m[i].replace('$', '');
    console.log(price);
  }
}

Upvotes: 1

slim
slim

Reputation: 41263

Regular expressions aren't always the right tool, but for this case it seems like an obvious choice. What you really want is everything that matches a $ followed by a mixture of numbers and commas, ending at any other character.

const re = /\$[\d,]+/
const string = 'I am a long sentence! My price is $5,000 on a discount!';
const prices = re.exec(string);
console.log(prices[0]);

You might want to expand the pattern, for example, to also match . -- /\$[\d,.]+ (would capture "$5,000.25") or to be extra permissive, just anything but a space: /\$[^ ]+/ (would capture "$tonsofmoney").

Upvotes: 2

Anupam
Anupam

Reputation: 201

You can try:

const string = 'I am a long sentence! My price is $5,000 on a   discount!';
const price = (string.split("$")[1].split(" ")[0]);
document.write(price);

Upvotes: 2

Seb
Seb

Reputation: 1551

Please try this. I'm splitting it into multiple rows for better readability.

const string = 'I am a long sentence! My price is $5,000 on a discount!';
var dollarPosition = string.lastIndexOf("$");
var nextSpace = string.indexOf(" ", dollarPosition+1);
const price = string.substring(dollarPosition+1,nextSpace);
document.write(price);

Upvotes: 1

iHasCodeForU
iHasCodeForU

Reputation: 177

you can use string.split()

const string = 'I am a long sentence! My price is $5,000 on a discount!';
const price = (string.split('$')[1]).split(' ')[0];
document.write(price);

this splits the string at the first index of $ and takes the part after the $.
than it splits the string at the first appearance of a space and takes the part before the space.

note that this expects that there is only 1 $ sign in the string.

Upvotes: 0

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