Windows Executable / Dangerous Extension Blocklist Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching windows executable / dangerous extension blocklist, 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

// Windows Executable / Dangerous Extension Blocklist
// ReDoS-safe | RegexVault — Dev & Systems > File Paths

const windowsExecutableDangerousExtensionBlocklistRegex = /\.(exe|bat|cmd|com|pif|scr|vbs|vbe|js|jse|wsf|wsh|msi|ps1|psm1|psd1|lnk|hta|jar|py|sh|bash|zsh|fish|dll|sys|drv|reg|inf)$/i;

function validateWindowsExecutableDangerousExtensionBlocklist(input: string): boolean {
  return windowsExecutableDangerousExtensionBlocklistRegex.test(input);
}

// Example
console.log(validateWindowsExecutableDangerousExtensionBlocklist("malware.exe")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > File Paths 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

Use as a BLOCKLIST — a MATCH means the file should be blocked or handled with elevated caution. This list is not exhaustive. Adjust based on your threat model and deployment environment.