Indian IFSC Code Regex for Go

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching indian ifsc code, 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

// Indian IFSC Code
// ReDoS-safe | RegexVault — Finance > Bank Identifiers

package validation

import "regexp"

var indianIfscCodeRe = regexp.MustCompile(`^[A-Z]{4}0[A-Z0-9]{6}$`)

func ValidateIndianIfscCode(s string) bool {
    return indianIfscCodeRe.MatchString(s)
}

// Example
// fmt.Println(ValidateIndianIfscCode("SBIN0001234")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Bank 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

The 5th character is always 0 (zero, reserved for future use). Used for NEFT, RTGS, and IMPS transfers. The Reserve Bank of India maintains the authoritative IFSC directory.