Names

Names["string"]

gives a list of the names of symbols that match the string.

Names[patt]

gives a list of names matching the arbitrary string pattern patt.

Details and Options

Names["string"] gives the same list of names as ?string.
Names returns a list of strings corresponding to the names of symbols.
The string can contain the following metacharacters:
* match zero or more characters

@ match one or more characters, but not uppercase letters
Names["context`*"] lists all symbols in the specified context.
With SpellingCorrection->True, Names includes names that differ in a small fraction of their characters from those specifically requested.
With IgnoreCase->True or SpellingCorrection->True, Names treats lowercase and uppercase letters as equivalent when matching names.
Names[] lists all names in all contexts.