JavaScript / ECMAScript

PEM Certificate Block in JS

Match PEM-encoded certificate and key blocks, capturing the block type and base64 content.

Try it in the JS tester →

Pattern

regexJS
-----BEGIN ([A-Z ]+)-----([\s\S]+?)-----END \1-----   (flags: g)

JavaScript / ECMAScript code

jsJavaScript
const re = new RegExp("-----BEGIN ([A-Z ]+)-----([\\s\\S]+?)-----END \\1-----", "g");
const input = "-----BEGIN CERTIFICATE-----\\nMIIBkTCB+...\\n-----END CERTIFICATE-----";
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

-----BEGIN ([A-Z ]+)----- captures the block type label (e.g. CERTIFICATE, RSA PRIVATE KEY). ([\s\S]+?) lazily captures the multiline base64 body. \1 back-references the type to ensure BEGIN and END labels match. The dotAll behaviour requires [\s\S] in JS (or /s flag in newer JS) and re.DOTALL in Python.

Examples

Input

-----BEGIN CERTIFICATE-----\nMIIBkTCB+...\n-----END CERTIFICATE-----

Matches

  • -----BEGIN CERTIFICATE-----\nMIIBkTCB+...\n-----END CERTIFICATE-----

Input

-----BEGIN RSA PRIVATE KEY-----\nMIIEow...\n-----END RSA PRIVATE KEY-----

Matches

  • -----BEGIN RSA PRIVATE KEY-----\nMIIEow...\n-----END RSA PRIVATE KEY-----

Same pattern, other engines

Python (re)

Supported

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

Go (RE2)

See workaround

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

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