Validation

SWIFT / BIC Code

Validate SWIFT/BIC bank identifier codes — 8 chars (head office) or 11 chars (branch).

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("^[A-Z]{6}[A-Z0-9]{2}(?:[A-Z0-9]{3})?$", "");
const input = "DEUTDEFF";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

pattern = re.compile(r"^[A-Z]{6}[A-Z0-9]{2}(?:[A-Z0-9]{3})?$")
input_text = "DEUTDEFF"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^[A-Z]{6}[A-Z0-9]{2}(?:[A-Z0-9]{3})?$`)
	input := `DEUTDEFF`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

Pattern

regexengine-agnostic

^[A-Z]{6}[A-Z0-9]{2}(?:[A-Z0-9]{3})?$

Raw source: ^[A-Z]{6}[A-Z0-9]{2}(?:[A-Z0-9]{3})?$

How it works

[A-Z]{6} matches the bank-and-country prefix. [A-Z0-9]{2} matches the location code. (?:[A-Z0-9]{3})? optionally matches the 3-character branch code, allowing both 8-char head-office BICs and 11-char branch BICs.