JavaScript - check if string contains only numbers

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In this article, we want to show how in JavaScript using simple regular expressions, check if the string contains only numbers.

Example expressions:

  1. /^[0-9]+$/
  2. /^[0-9]{1,}$/
  3. /^\d+$/
  4. /^\d{1,}$/ 

For example, we can select the first one, and do some tests with match() function:

// ONLINE-RUNNER:browser;

var expression = /^[0-9]+$/;
var text = '1000500100900';

if (text.match(expression)) {
    console.log('I am number!');

See also

  1. JavaScript - integer regular expression 

Alternative titles

  1. JavaScript - how to check if a string contains only numbers?
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