Numbers & Finance · In-Browser Regular Expression Lab

IBAN Regex — International Bank Account Number Validation

Validates canonical IBAN structure: 2-letter country code, 2-digit checksum, and up to 30 alphanumeric characters.

Pattern:

Regular Expression Pattern & Flags

Flags:

//none

Live Test String

Match Found

Load Sample:

Match Inspection & Details1 match

Match #1:GB82WEST12345698765432

Test Samples Verification Matrix

Expected Valid Samples (Should Match)

GB82WEST12345698765432 Pass

DE89370400440532013000 Pass

FR1420041010050500013M02606 Pass

Expected Invalid Samples (Must Reject)

1282WEST123456 Rejected (Pass)

GB82WEST Rejected (Pass)

DE8937040044053201300099999999999 Rejected (Pass)

Code Implementation Generator

// JavaScript / TypeScript (ES6+)
const pattern = /^[A-Z]{2}[0-9]{2}[A-Z0-9]{4}[0-9]{7}([A-Z0-9]?){0,16}$/;
const text = "GB82WEST12345698765432";

const isMatch = pattern.test(text);
console.log("Is Match:", isMatch);

if (isMatch) {
  const matches = text.match(pattern);
  console.log("Matches:", matches);
}

Regular Expression Token Breakdown

Conforms to ISO 13616 standard for international bank account representation. Each component of the regular expression serves a distinct syntactical purpose as mapped below:

Token Pattern	Name / Component	Function & Rule
^[A-Z]{2}	Country Code	Two-letter ISO 3166-1 alpha-2 code.
[0-9]{2}	Check Digits	Two check digits calculated via mod 97.
[A-Z0-9]{4}	Bank Code	Basic Bank Account Number (BBAN) prefix.
[0-9]{7}	Account number	Standardized account digits.

Frequently Asked Questions

Does this regex allow spaces?

Electronic IBANs must not contain spaces. For printed IBANs, strip whitespace prior to matching.

Browse All 40 Patterns

Numbers & Finance

Credit Card (Visa & Mastercard)

Detects Visa and Mastercard credit card format with optional space or hyphen delimiters.

/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|2(?:22[1-9]|2[3-9][0-9]|[3-6][0-9]{2}|7[01][0-9]|720)[0-9]{12})$/

Test regex

Numbers & Finance

US Phone Number Format

Flexible US phone number validator matching standard parentheses, hyphens, and spaces.

/^(?:\+?1\s*(?:[.-]\s*)?)?(?:\(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\s*\)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(?:[.-]\s*)?([2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\s*(?:[.-]\s*)?([0-9]{4})$/

Test regex

Data & Formatting