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I want to search for CatalogueManager, so I use Shift-Alt-O, and write 'CĪ' (capital). It will match also classes like: CatalogueVersionDocument (because it contains a C and an m). But it should not match such classes.
You need to check the case sensitive check box. When not case sensitive the capital is just used as separator which may be followed by anything in our case 'CM' will become /C.*M.*/i.