What is the regex for aws region?

The regex pattern for aws region is `^[a-z]{2}-[a-z]+-\d$`. This pattern validates aws region identifier (e.g. us-east-1).

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^[a-z]{2}-[a-z]+-\d$/;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

How do I use this regex in Python?

In Python, use `import re; re.match(r'^[a-z]{2}-[a-z]+-\d$', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

By default, yes. To make it case-insensitive, add the `i` flag in JavaScript (`/^[a-z]{2}-[a-z]+-\d$/i`) or use `re.IGNORECASE` in Python.

Regex for AWS Region

Regex Pattern

^[a-z]{2}-[a-z]+-\d$

AWS region identifier (e.g. us-east-1)

Quick Answer

The regex pattern for aws region is `^[a-z]{2}-[a-z]+-\d$`. AWS region identifier (e.g. us-east-1). This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
us-east-1	✓ Matches
eu-west-2	✓ Matches
ap-southeast-1	✓ Matches
US-EAST-1	✗ No match
us-east	✗ No match
us-east-1a	✗ No match
invalid	✗ No match

Code Examples

javascript

const regex = /^[a-z]{2}-[a-z]+-\d$/;
const isValid = regex.test(value);

python

import re
pattern = r'^[a-z]{2}-[a-z]+-\d$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^[a-z]{2}-[a-z]+-\d$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^[a-z]{2}-[a-z]+-\d$/', $value)) {
    echo "valid";
}

java

String pattern = "^[a-z]{2}-[a-z]+-\\d$";
boolean isValid = value.matches(pattern);

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