krypton · May 8, 2013 14:44 · May 8, 2013
diff --git a/ibanvalidator.js b/ibanvalidator.js
@@ -0,0 +1,40 @@
+function validateIBAN(iban) {
+    var newIban = iban.toUpperCase(),
+        modulo = function (divident, divisor) {
+            var cDivident = '';
+            var cRest = '';
+
+            for (var i in divident ) {
+                var cChar = divident[i];
+                var cOperator = cRest + '' + cDivident + '' + cChar;
+
+                if ( cOperator < parseInt(divisor) ) {
+                        cDivident += '' + cChar;
+                } else {
+                        cRest = cOperator % divisor;
+                        if ( cRest == 0 ) {
+                            cRest = '';
+                        }
+                        cDivident = '';
+                }
+
+            }
+            cRest += '' + cDivident;
+            if (cRest == '') {
+                cRest = 0;
+            }
+            return cRest;
+        };
+
+    if (newIban.search(/^[A-Z]{2}/gi) < 0) {
+        return false;
+    }
+
+    newIban = newIban.substring(4) + newIban.substring(0, 4);
+
+    newIban = newIban.replace(/[A-Z]/g, function (match) {
+        return match.charCodeAt(0) - 55;
+    });
+
+    return parseInt(modulo(newIban, 97), 10) === 1;
+}