How to find a number in a string using JavaScript?

user_196446 0
Viewed 160719

Suppose I have a string like - "you can enter maximum 500 choices". I need to extract 500 from the string.

The main problem is the String may vary like "you can enter maximum 12500 choices". So how to get the integer part?

javascript regex
9 Answers

var regex = /\d+/g;
var string = "you can enter 30%-20% maximum 500 choices";
var matches = string.match(regex);  // creates array from matches

document.write(matches);

user_23423580

You can also try this : 

var string = "border-radius:10px 20px 30px 40px";
var numbers = string.match(/\d+/g).map(Number);
console.log(numbers)

user_108838580

I thought I'd add my take on this since I'm only interested in the first integer I boiled it down to this:

let errorStringWithNumbers = "error: 404 (not found)";        
let errorNumber = parseInt(errorStringWithNumbers.toString().match(/\d+/g)[0]);

.toString() is added only if you get the "string" from an fetch error. If not, then you can remove it from the line.

user_74264820 
// stringValue can be anything in which present any number
`const stringValue = 'last_15_days';
// /\d+/g is regex which is used for matching number in string
// match helps to find result according to regex from string and return match value
 const result = stringValue.match(/\d+/g);
 console.log(result);`

output will be 15

If You want to learn more about regex here are some links:

https://www.w3schools.com/jsref/jsref_obj_regexp.asp

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

https://www.tutorialspoint.com/javascript/javascript_regexp_object.htm

Admin1

Now this is very easy to do using the 'replace' method and 'regexp'. For example:

findNumber = str => {
  return +(str.replace(/\D+/g, ''));
}

console.log(findNumber("you can enter maximum 500 choices"));
console.log(findNumber("you can enter maximum 12500 choices"));

user_95862300
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