Semantic Version (Full SemVer 2.0.0) Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching semantic version (full semver 2.0.0), ported and verified for JavaScript. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// Semantic Version (Full SemVer 2.0.0)
// ReDoS-safe | RegexVault — Dev & Systems > SemVer

const semanticVersionFullSemver200Regex = /^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(?:-((?:0|[1-9][0-9]*|[0-9]*[a-zA-Z\-][a-zA-Z0-9\-]*)(?:\.(?:0|[1-9][0-9]*|[0-9]*[a-zA-Z\-][a-zA-Z0-9\-]*))*))?(?:\+([a-zA-Z0-9\-]+(?:\.[a-zA-Z0-9\-]+)*))?$/;

function validateSemanticVersionFullSemver200(input: string): boolean {
  return semanticVersionFullSemver200Regex.test(input);
}

// Example
console.log(validateSemanticVersionFullSemver200("1.0.0")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > SemVer category and carries a ReDoS-safe certification. That matters for JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

Official SemVer 2.0.0 regex from semver.org. Capture groups: 1=MAJOR, 2=MINOR, 3=PATCH, 4=pre-release, 5=build metadata. Leading zeros in numeric identifiers are forbidden.