Blood Type / Blood Group Regex for Go

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching blood type / blood group, 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

// Blood Type / Blood Group
// ReDoS-safe | RegexVault — Identity & PII > Biometric & Physical

package validation

import "regexp"

var bloodTypeBloodGroupRe = regexp.MustCompile(`^(A|B|AB|O)[+-]$`)

func ValidateBloodTypeBloodGroup(s string) bool {
    return bloodTypeBloodGroupRe.MatchString(s)
}

// Example
// fmt.Println(ValidateBloodTypeBloodGroup("A+")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Biometric & Physical 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

ABO blood groups: A, B, AB, O. Rh factor: + (positive) or - (negative). O- (O negative) is the universal donor for red blood cells. AB+ is the universal recipient. Blood type is health data classified as sensitive under GDPR Article 9.