TSynEdit
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TSynEdit 
is a text editor component that provides, among other things, the display-part of syntax-highlighting editing. It is part of the SynEdit package and is available under the SynEdit tab of the Component Palette.
TSynEdit is used in conjunction with a specific syntax highlighter that is connected through the Highlighter property of the TSynEdit.
Example
From the Free Pascal wiki, page "TSynEdit", as it stood on 2019-09-12 after a change by Djzepi, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.