JavaScript / ECMAScript

Python Package Name (PEP 508) in JS

Validate Python distribution package names per PEP 508: letters, digits, dots, underscores, hyphens.

Try it in the JS tester →

Pattern

regexJS
^[A-Za-z0-9](?:[A-Za-z0-9._\-]*[A-Za-z0-9])?$

JavaScript / ECMAScript code

jsJavaScript
const re = new RegExp("^[A-Za-z0-9](?:[A-Za-z0-9._\\-]*[A-Za-z0-9])?$", "");
const input = "requests";
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

Starts and ends with alphanumeric. Allows `_`, `.`, `-` in the middle. The single-char form (just an alphanumeric) is also valid. PEP 508 / PEP 503 normalize all of `_`, `.`, `-` to a single `-` for matching, but the underlying name on PyPI may use any.

Examples

Input

requests

Matches

  • requests

Input

django-rest-framework

Matches

  • django-rest-framework

Input

_invalid

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).

← Back to Python Package Name (PEP 508) overview (all engines)