Added toUpperCase string check for better accuracy
Added toUpperCase string check for better accuracy

Kindling/react-tinymce-mention,Kindling/react-tinymce-mentions,Kindling/react-tinymce-mention,catalinmiron/react-tinymce-mention,Kindling/react-tinymce-mentions,Kindling/react-tinymce-mentions,catalinmiron/react-tinymce-mention,catalinmiron/react-tinymce-mention,Kindling/react-tinymce-mention