UK Postcode Regex Pattern

Live Regex Tester

Pattern Breakdown

Code Examples

const regex = /^[A-Z]{1,2}\d[A-Z\d]?\s?\d[A-Z]{2}$/i;
const test = "SW1A 1AA";
console.log(regex.test(test)); // true

// Extract matches
const matches = test.match(regex);
console.log(matches);

import re

pattern = r'^[A-Z]{1,2}\d[A-Z\d]?\s?\d[A-Z]{2}$'
test = "SW1A 1AA"
match = re.search(pattern, test, re.IGNORECASE)
print(match)  # Found!

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`^[A-Z]{1,2}\d[A-Z\d]?\s?\d[A-Z]{2}$`)
    fmt.Println(re.MatchString("SW1A 1AA")) // true
}

Common Use Cases

Match Examples

About the UK Postcode Regex

Validates UK postcodes in various formats (A1 1AA, A11 1AA, AA1 1AA, etc.) with optional space.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The uk postcode pattern is classified as intermediate difficulty in the identity & documents category. It works in all major programming languages.

When using this regex, always consider edge cases and test thoroughly with real-world data. Use the interactive tester above to validate the pattern against your specific inputs before deploying to production.

More Identity & Documents Patterns