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jedit is an option also. Very simple to make macros to insert the needed character in unicode, you can customize the keyboard shortcuts (to run your macro to insert character) with any weird combination of keys your heart desires, so easy to make them easy to remember. It is a bit resource hungry ...

When performing "replace all" operation.......sometimes people make stupid choices of replacements/regex....and the operation will freeze up textpad or make computer slow to crawl. For the replaceall, would it be possible to lock the current buffer from being changed, run the replace on background ...