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

Numbers only regex (digits only)

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

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JavaScript
Python
Java
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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