JavaScript / ECMAScript

HTTP Status Code in JS

Match 3-digit HTTP status codes in the 1xx–5xx range.

Try it in the JS tester →

Pattern

regexJS
\b[1-5]\d{2}\b   (flags: g)

JavaScript / ECMAScript code

jsJavaScript
const re = new RegExp("\\b[1-5]\\d{2}\\b", "g");
const input = "HTTP 200 OK";
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

Leading digit 1–5 covers all standard class codes (informational, success, redirect, client error, server error), followed by any two digits. Word boundaries prevent partial matches.

Examples

Input

HTTP 200 OK

Matches

  • 200

Input

Returned 404, then 500

Matches

  • 404
  • 500

Input

no codes 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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