FindSettings

is a global option that specifies settings for the Find interface.

Details

"FindBoxes"	RowBox[{""}]	stores the value of the last box that was searched for using the Find interface
"FindHistory"	{}	history of values used in the search input field of the Find interface
"IgnoreCase"	False	specifies whether a search carried out using the Find command is case-sensitive
"ReplaceBoxes"	RowBox[{""}]	stores the value of the box to be inserted in place of the highlighted text
"ReplaceHistory"	{}	history of values used in the replace input field of the Find interface
"WholeWord"	False	whether to require that the text searched for appear as a word
"WindowMargins"	Automatic	specifies the size of margins around the Find interface
"Wraparound"	True	specifies whether a search should be continued at the start of a notebook when the search reaches the end

"FindBoxes" is usually set by typing text into the Find field of the Find interface, which is accessed by choosing the Edit ▶ Find menu item.
You can search for typeset expressions by specifying the box structure with "FindBoxes". For example, to search for the next occurrence of , you can set "FindBoxes"->RowBox[{SuperscriptBox["x","2"],"+",SuperscriptBox["y","2"]}].
You must perform a search using one of the buttons in the Find interface for the value of "FindBoxes" to be updated.
"ReplaceBoxes" is usually set by typing text into the Replace field of the Find interface.
You must perform a search using one of the buttons in the Find interface for the value of "ReplaceBoxes" to be updated.
You can replace text with a typeset expressions by specifying the box structure with "ReplaceBoxes".
"IgnoreCase" is usually set using the Ignore case checkbox of the Find interface.
With the setting "IgnoreCase"->False, searches are case-sensitive.
With the setting "WholeWord"True, searches are constrained to begin and end at word boundaries.
With the default setting "Wraparound"->True, a search that reaches the end of a notebook is continued at the start of that notebook.
With the setting "Wraparound"->False, a search terminates when it reaches the end of a notebook.

To modify the values in FindSettings, use SetOptions:

Wolfram Language code: SetOptions[$FrontEnd, FindSettings -> {"FindBoxes" :> "", "FindHistory" :> {}, "ReplaceHistory" :> {}}]

This programmatically sets the value of the "IgnoreCase" option in FindSettings:

Wolfram Language code: SetOptions[$FrontEnd, FindSettings -> {"IgnoreCase" -> True}]

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