feat:#4 extracted token regex test

frontend/src/helpers/token.ts

@@ -0,0 +1,19 @@
+const tokenRegex = /^[a-z0-9]{15}$/;
+const tokenUriRegex = /[?&]token=([a-z0-9]{15})(?:&|$)/;
+
+export const isToken = (token: string): boolean => {
+  return tokenRegex.test(token) || tokenUriRegex.test(token);
+};
+
+export function extractToken(token: string): string {
+  if (tokenRegex.test(token)) {
+    return token;
+  }
+
+  const match = tokenUriRegex.exec(token);
+  if (match) {
+    return match[1];
+  }
+
+  throw new Error("Invalid token");
+}