Library
Current regex:
Numbers only regex (digits only)
JavaScript

JavaScript

ZIP code regex
ZIP code
XML regex
XML
UUID regex
UUID
URL regex
URL
Street address regex
Street address
SSN regex
SSN
Phone number regex
Phone number
Password regex
Password
Numbers only regex (digits only)
Numbers only (digits only)
Regex match words
Words match
Mac address regex
Mac address
IP address regex
IP address
HTML regex (regex remove html tags)
HTML
GUID regex
GUID
Email regex
Email
Date regex
Date
Numbers only regex (digits only)

Numbers only (digits only)

Numbers only (or digits only) regular expressions can be used to validate if a string contains only numbers.

JavaScript
JavaScript
Python
Python
Java
Java
C#
C#
PHP
PHP

Basic numbers only regex

Below is a simple regular expression that allows validating if a given string contains only numbers:

/^\d+$/

Test it!
/^\d+$/

True

False

Enter a text in the input above to see the result

Example code in Javascript:

var numberRegex = /^\d+$/;
// Validate numbers
numberRegex.test('12122022'); // Returns true
numberRegex.test('Hey12122022x'); // Returns false

// Extract a number from a string
var numberRegexG = /\d$/g;
'Your message was viewed 203 times'.match(numberRegexG); // returns ['203']

Real number regex

Real number regex can be used to validate or exact real numbers from a string.

/^(?:-(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))|(?:0|(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))))(?:.\d+|)$/

Test it!
/^(?:-(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))|(?:0|(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))))(?:.\d+|)$/

True

False

Enter a text in the input above to see the result

Example code in Javascript:

var numberRegex = /^(?:-(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))|(?:0|(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))))(?:.\d+|)$/;
// Validate numbers
numberRegex.test('121220.22'); // Returns true
numberRegex.test('Hey12122022x'); // Returns false

// Extract a real number from a string
var numberRegexG = /(?:-(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))|(?:0|(?:[1-9](?:\d{0,2}(?:,\d{3})+|\d*))))(?:.\d+|)/g;
'Pi equals to 3.14'.match(numberRegexG); // returns ['3.14']

Test it!

True

False

Enter a text in the input above to see the result

Notes on number only regex validation

In JavaScript you can also validate number by trying to parse it using a Number constructor and then using isNaN function of a Number class:

var number = Number('22.2x');
Number.isNaN(number); // returns true