EU European Health Insurance Card (EHIC) Number Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching eu european health insurance card (ehic) number, ported and verified for JavaScript. Identity and credential patterns need both correctness and safety, since they're frequent targets for adversarial input. 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

// EU European Health Insurance Card (EHIC) Number
// ReDoS-safe | RegexVault — Identity & PII > Health Identifiers

const euEuropeanHealthInsuranceCardEhicNumberRegex = /^[A-Z0-9]{8,20}$/;

function validateEuEuropeanHealthInsuranceCardEhicNumber(input: string): boolean {
  return euEuropeanHealthInsuranceCardEhicNumberRegex.test(input);
}

// Example
console.log(validateEuEuropeanHealthInsuranceCardEhicNumber("12345678")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Health Identifiers 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

EHIC personal identification numbers vary significantly by issuing country. The card itself contains: country code, personal identification number, card number, and expiry date. Use country-specific patterns when the issuing country is known. UK issued the Global Health Insurance Card (GHIC) post-Brexit.