message: Remove global flag
  Regular expression objects are stateful, and the global flag interferes badly with the expression. A valid call can cause it to act like a flip flop instead of a stateless test.
diff: @@ -28,7 +28,7 @@ import { _t } from './languageHandler';
  // Regex for what a "safe" or "Matrix-looking" localpart would be.
  // TODO: Update as needed for https://github.com/matrix-org/matrix-doc/issues/1514
  -export const SAFE_LOCALPART_REGEX = /^[a-z0-9=_\-./]+$/g;
  +export const SAFE_LOCALPART_REGEX = /^[a-z0-9=_\-./]+$/;
  /**
  * Starts either the ILAG or full registration flow, depending
  