Python (re)

npm Package Name in PY

Validate npm package names including scoped packages (@org/package), per the npm naming spec.

Try it in the PY tester →

Pattern

regexPY
^(?:@[a-z0-9\-*~][a-z0-9\-*._~]*\/)?[a-z0-9\-~][a-z0-9\-._~]*$

Python (re) code

pyPython
import re

pattern = re.compile(r"^(?:@[a-z0-9\-*~][a-z0-9\-*._~]*\/)?[a-z0-9\-~][a-z0-9\-._~]*$")
input_text = "react"
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

The optional group (?:@[a-z0-9\-*~][a-z0-9\-*._~]*\/)? matches a @scope/ prefix for scoped packages. The main name [a-z0-9\-~][a-z0-9\-._~]* matches lowercase letters, digits, hyphens, dots, and tildes. Uppercase is not allowed per npm rules.

Examples

Input

react

Matches

  • react

Input

@types/node

Matches

  • @types/node

Input

MyPackage

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).

← Back to npm Package Name overview (all engines)