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

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 Go. 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 Go project — whether you're validating in a Gin handler, a gRPC service, or a command-line tool.

Go Implementation

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

package validation

import "regexp"

var euEuropeanHealthInsuranceCardEhicNumberRe = regexp.MustCompile(`^[A-Z0-9]{8,20}$`)

func ValidateEuEuropeanHealthInsuranceCardEhicNumber(s string) bool {
    return euEuropeanHealthInsuranceCardEhicNumberRe.MatchString(s)
}

// Example
// fmt.Println(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 Go developers because Go's RE2 engine is inherently safe from catastrophic backtracking, but this pattern has been additionally verified for correctness. 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.