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In Notepad++ there is a menu option: Language->"User-Defined".

How do I customize that? What are capabilities of such option?

Can I highlight date/time? Can I highlight 21-29th symbols in the lines? Can I use RegExp?

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1 Answer 1

The following npp-wiki page explains how to do that:

How to create your own definition (user-defined language) of a Syntax Highlighting scheme

However, the language you need may be already defined by someone-else in User Defined Language List. You may check that list out first.

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