In some scenarios, there are bidi neutral characters (such as "?" or "!") in the suffix of left to right title, for example https://en.wikipedia.org/wiki/E! or https://en.wikipedia.org/wiki/Human_Rights_Now!
With RTL interface, either [[//he.wikipedia.org|he]] / [[//ar.wikipedia.org|ar]] wikis or [[https://en.wikipedia.org/wiki/Main_Page?uselang=he|enwiki with RTL interface]] (or commons), writing such titles in the search box looks like "!E" instead of "E!" in the browser (due to bidi algorithm), and this may be a common pitfall[1] for bi-directional users. If this is the case and there are no results, the search **backend**[2] can workaround such pitfall easily with regular expressions, e.g /([?!]+)([a-z])/ =>$2$1
Notes:
[1] I don't have access to the failed search queries DB, so here is approximation based on wrong redlinks added by editors (not readers) within the article text itself:
```use hewiki_p; select pl_title,count(*) from pagelinks where (pl_title like '?%' or pl_title like '!%') and pl_namespace=0 group by pl_title order by count(*) desc;```
[2] It may be hard/impossible to handle it in the frontend to properly show [?!] in the end of the query, since there are too many skins/browsers/externals clients