You can use these shortcuts when typing into a symbol name field to specify strict prefix matching, or member name matching:
To match strictly prefixes only, prefix the spec with a single space or the caret ^ character.
For example, ^Format and <space>Format will match only symbols that start with "format". (Case insensitively.) It will not match "LineFormat". The prefix actually toggles name fragment matching on and off.
To match strictly prefixes of member names, prefix the spec with a dot . character. For example, .fdirty will match only struct or class members that start with "fdirty". This also works with nested class members. For example, .draw will match the method "Class1::Class2::Draw".
Underscores, which are common in program identifier names, are ignored. For example, _insert, and insert would also appear in the list together.