From d89d202f28587a09c96faaf4de932e20542dfb4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Seshanth=2ES=F0=9F=90=BA?=
 <35675963+seshanthS@users.noreply.github.com>
Date: Thu, 19 Jun 2025 13:52:00 +0530
Subject: [PATCH] fix: update TD1 and TD3 checks (#643)

---
 app/src/utils/utils.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/app/src/utils/utils.ts b/app/src/utils/utils.ts
index 5580c79a1..8291a6b63 100644
--- a/app/src/utils/utils.ts
+++ b/app/src/utils/utils.ts
@@ -2,9 +2,13 @@
 export function extractMRZInfo(mrzString: string) {
   const mrzLines = mrzString.split('\n');
 
-  // Check format based on line length
-  const isTD1 = mrzLines[0].length === 30 || mrzLines[0].startsWith('ID');
-  const isTD3 = mrzLines[0].length === 44;
+  //line 1 and line 2 - concated
+  const TD1_REGEX =
+    /^(?<documentType>[A-Z0-9<]{2})(?<issuingCountry>[A-Z<]{3})(?<documentNumber>[A-Z0-9<]{9})(?<checkDigitDocumentNumber>[0-9]{1})(?<optionalData1>[A-Z0-9<]{15})(?<dateOfBirth>[0-9]{6})(?<checkDigitDateOfBirth>[0-9]{1})(?<sex>[MF<]{1})(?<dateOfExpiry>[0-9]{6})(?<checkDigitDateOfExpiry>[0-9]{1})(?<nationality>[A-Z<]{3})(?<optionalData2>[A-Z0-9<]{7})/;
+  const TD3_line_2_REGEX = /^([A-Z0-9<]{9})([0-9ILDSOG])([A-Z<]{3})/;
+
+  const isTD1 = TD1_REGEX.test(mrzLines[0]) || mrzLines[0].startsWith('I');
+  const isTD3 = TD3_line_2_REGEX.test(mrzLines[1]);
 
   if (!isTD1 && !isTD3) {
     throw new Error(