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

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Here you have simple RegExes that can used to check It:

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

Select one above pattern with function match.

Example:

// ONLINE-RUNNER:browser;

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

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