JavaScript / ECMAScript

SSH Public Key in JS

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

Try it in the JS tester →

Pattern

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

JavaScript / ECMAScript code

jsJavaScript
const re = new RegExp("ssh-(?:rsa|dss|ed25519|ecdsa-sha2-nistp(?:256|384|521))\\s+[A-Za-z0-9+\\/=]+(?:\\s+\\S+)?", "g");
const input = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBVxr alice@laptop";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

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

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Same pattern, other engines

Python (re)

Supported

See how this pattern looks (and behaves) in Python's stdlib `re` module.

Go (RE2)

Supported

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

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