You are performing tests on the search bar available in a web or mobile application. During the tests, you find out that the search results tend to be unreliable when some special characters are included in the search query (such as @, #, %, $, or quotation marks). Sometimes it returns nothing, and in others, it provides wrong or incomplete matches. It might even crash or produce an error in the application when the user tries to search.
It raises a question as to how the application will manage the special characters in the user input; for it might include problems such as improper input validation, incorrect encoding/decoding, or, in general, does not support special characters in the logic with which search queries are processed.
