REGEXVAULTv2.0
Finance/Tax & Registration
Verified Safe

UK UTR (Unique Taxpayer Reference) Regex for Go

/^[0-9]{10}$/

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching uk utr (unique taxpayer reference), ported and verified for Go. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. 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

Go
// UK UTR (Unique Taxpayer Reference)
// ReDoS-safe | RegexVault — Finance > Tax & Registration

package validation

import "regexp"

var ukUtrUniqueTaxpayerReferenceRe = regexp.MustCompile(`^[0-9]{10}$`)

func ValidateUkUtrUniqueTaxpayerReference(s string) bool {
    return ukUtrUniqueTaxpayerReferenceRe.MatchString(s)
}

// Example
// fmt.Println(ValidateUkUtrUniqueTaxpayerReference("1234567890")) // true

Test Cases

Matches (Valid)
Rejects (Invalid)
1234567890123456789
000000000012345678901
98765432101234567890A
1234 567890

When to use this pattern

This pattern is drawn from the Finance > Tax & Registration 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

UTRs should not be displayed publicly as they are sensitive tax identifiers. Treat with the same care as SSNs.

Technical Notes

Issued by HMRC to individuals and companies for self assessment. Personal UTR and company UTR are both 10 digits but used in different contexts. The first digit of a company UTR indicates the type (0-9).

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