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On TeX.SE the Help Centre says that the following is on topic:
Formats like LaTeX, ConTeXt and plain TeX
Engines like pdfTeX, LuaTeX and XeTeX
Distributions like TeX Live, MiKTeX, and MacTeX
Related software and tools, BibTeX, MakeIndex, Lyx, etc.
I wanted to write a RegEx to match all on-topi...