A character is being substituted with a so-called WILDCARD when you try to search for a file (CTRL+F or CTRL + H).
Try the following below:
The questin Mark (?)- It can be used to return a single character; d?g would return dig, dog, dag, dug, and deg
The Asterisk (*) - This can be used to return results for any combination of characters; for example, e*t will return eat, east,etc.
The square brace [ ] This will return words containing any of the enclosed characters; for example, d[ie]t will return die and det
Left square brace[ and Round braces( )- This will return words beginning with a certain string of characters; for example, [(per) will return person but not camper
Round braces ( )and Right Square brace ] - This will return words ending with a certain string of characters; (per)] will return camper but not person