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backend/node_modules/validator/es/lib/isBIC.js

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+import assertString from './util/assertString';
+import { CountryCodes } from './isISO31661Alpha2';
+
+// https://en.wikipedia.org/wiki/ISO_9362
+var isBICReg = /^[A-Za-z]{6}[A-Za-z0-9]{2}([A-Za-z0-9]{3})?$/;
+export default function isBIC(str) {
+  assertString(str);
+
+  // toUpperCase() should be removed when a new major version goes out that changes
+  // the regex to [A-Z] (per the spec).
+  var countryCode = str.slice(4, 6).toUpperCase();
+  if (!CountryCodes.has(countryCode) && countryCode !== 'XK') {
+    return false;
+  }
+  return isBICReg.test(str);
+}