Python (re)

SSH Public Key in PY

Match SSH public keys in OpenSSH `authorized_keys` format, including the optional comment field.

Try it in the PY tester →

Pattern

regexPY
ssh-(?:rsa|dss|ed25519|ecdsa-sha2-nistp(?:256|384|521))\s+[A-Za-z0-9+\/=]+(?:\s+\S+)?   (flags: g)

Python (re) code

pyPython
import re

pattern = re.compile(r"ssh-(?:rsa|dss|ed25519|ecdsa-sha2-nistp(?:256|384|521))\s+[A-Za-z0-9+\/=]+(?:\s+\S+)?")
input_text = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBVxr alice@laptop"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

How the pattern works

ssh-(?:rsa|dss|ed25519|ecdsa-sha2-nistp(?:256|384|521)) matches the key-type prefix for the four common algorithms. \s+ requires whitespace before the base64 body. [A-Za-z0-9+\/=]+ matches the base64-encoded key material. (?:\s+\S+)? optionally matches a trailing comment (typically `user@host`).

Examples

Input

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBVxr alice@laptop

Matches

  • ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBVxr alice@laptop

Input

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAB

Matches

  • ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAB

Input

PRIVATE KEY HERE

No match

—

Same pattern, other engines

JavaScript / ECMAScript

Supported

See how this pattern looks (and behaves) in JavaScript's built-in RegExp.

Go (RE2)

Supported

See how this pattern looks (and behaves) in Go's `regexp` package (RE2 engine).

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