FilterRules[rules, patt] filters the list rules by picking out only those rules whose left-hand sides match patt.FilterRules[rules, {patt_1, patt_2, ...}] picks out rules ...
IgnoreCase is an option for string manipulation and searching functions that specifies whether lowercase and uppercase letters should be treated as equivalent.
Language is a global option that specifies the language in which menus, dialog boxes, error messages, and help files are displayed.
MultilaunchWarning is a global option that specifies whether a warning is given when you try to modify user preferences while running two copies of Mathematica simultaneously.
Needs
(Built-in Mathematica Symbol) Needs["context`"] loads an appropriate file if the specified context is not already in $Packages. Needs["context`", " file"] loads file if the specified context is not ...
PassEventsDown is an option to EventHandler which specifies whether events handled by a particular event handler should be passed down to event handlers nested inside.
RecordLists is an option for ReadList that specifies whether objects from separate records should be returned in separate sublists.
RotationAction is an option for three-dimensional graphics functions that specifies how to render 3D objects when they are interactively rotated.
ScriptBaselineShifts is an option for Style that specifies the minimum distance in x-heights to shift subscripts and superscripts.
ShowCellLabel is an option for Cell that specifies whether to display the label for a cell.