Changing Multiline Text
To find text
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From the Modify menu, choose Object. Then choose Text.
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Select a multiline text object.
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In the Multiline Text Editor dialog box, choose the Find/Replace tab.
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Enter the word that you want to find in the Find box.
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To match the case of letters in a word, check Match Case.
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To find text that is not part of another word, check Whole Word.
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To locate the word in the selected text, click the Find tool.
When the text object has been completely searched, AutoCAD LT displays a
message at the bottom of the dialog box to indicate that the search is
resuming at the beginning of the text object.
Object Properties toolbar:

Command line equivalent: DDEDIT