SSH Public Key Regex Pattern

Live Regex Tester

Pattern Breakdown

Code Examples

const regex = /^ssh-(rsa|ed25519|ecdsa)\s+[A-Za-z0-9+/=]+/;
const test = "ssh-rsa AAAAB3NzaC1yc2EAAA...";
console.log(regex.test(test)); // true

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

import re

pattern = r'^ssh-(rsa|ed25519|ecdsa)\s+[A-Za-z0-9+/=]+'
test = "ssh-rsa AAAAB3NzaC1yc2EAAA..."
match = re.search(pattern, test)
print(match)  # Found!

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`^ssh-(rsa|ed25519|ecdsa)\s+[A-Za-z0-9+/=]+`)
    fmt.Println(re.MatchString("ssh-rsa AAAAB3NzaC1yc2EAAA...")) // true
}

Common Use Cases

Match Examples

About the SSH Public Key Regex

Matches SSH public key format with algorithm prefix (rsa, ed25519, ecdsa) followed by Base64-encoded key data.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The ssh public key pattern is classified as intermediate difficulty in the security & auth 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 Security & Auth Patterns