Identifiers

npm Package Name

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

Try it in RegexPro →

Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

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

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

How it 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

—

Common use cases

  • •package.json validation in monorepo tooling
  • •Custom registry name enforcement
  • •Automated dependency auditing scripts
  • •CLI tools that accept package names as arguments

Related patterns

Python Package Name (PEP 508)

Identifiers

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

AWS S3 Bucket Name

Identifiers

Validate AWS S3 bucket names per the standard naming rules: 3–63 chars, lowercase, alphanumeric + dots + hyphens.

Kubernetes Pod Name (RFC 1123)

Identifiers

Validate Kubernetes pod names per the RFC 1123 DNS label rules — lowercase, ≤63 chars, no leading/trailing hyphen.

Kubernetes Label (key=value)

Identifiers

Validate Kubernetes label `key=value` pairs per the K8s naming spec.

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