Hebrew Calendar Date Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching hebrew calendar date, 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

// Hebrew Calendar Date
// ReDoS-safe | RegexVault — Localization > Date Formats

const hebrewCalendarDateRegex = /^(0?[1-9]|[12][0-9]|3[01])\/(0?[1-9]|1[0-3])\/(5[0-9]{3}|6[0-9]{3})$/;

function validateHebrewCalendarDate(input: string): boolean {
  return hebrewCalendarDateRegex.test(input);
}

// Example
console.log(validateHebrewCalendarDate("15/7/5784")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Date Formats 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

Hebrew calendar has 12 or 13 months (leap years add Adar II, hence month 13). Current year range 5700s-6000s (2024 CE = 5784-5785 AM). Month 13 is only valid in leap years — validate with a Hebrew calendar library.