JButton renameButton = new JButton("Rename");
    renameButton.addActionListener(e -> {
      final String newName = textField.getText().trim();
      if (!newName.isEmpty()) {
        if (newName.length() >= 1 &&
-            newName.chars().limit(1).allMatch(Character::isUnicodeIdentifierStart) &&
-            newName.chars().skip(1).allMatch(Character::isUnicodeIdentifierPart)) {
+            newName.chars().limit(1).allMatch(Character::isJavaIdentifierStart) &&
+            newName.chars().skip(1).allMatch(Character::isJavaIdentifierPart)) {
          rename(ps, binding, newName);
          window.setVisible(false);
        } else {
          String msg = String.format("'%s' is not a valid name", newName);
          JOptionPane.showMessageDialog(editor, msg, "Naming is Hard",
                                        JOptionPane.PLAIN_MESSAGE);
        }
      }
    });
      rootPane.setDefaultButton(renameButton);