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    We can't really help unless you provide example input and expected output. Do all target lines start with ## and a space? Can there be text after the (#some-title)? Why are you escaping th #? Most importantly, what OS are you using so we know what sed implementation you have? Commented Jul 18 at 9:42
  • Aside: Don't use -i in examples in questions or answers as then people reading them can't copy/paste your code to test it without trashing their input file. It's trivial for you to add -i (or do anything else that updates the input file) later if you want it. Commented Jul 18 at 11:41
  • Can Some title include (, ], #, ), or newlines? Please edit your question to tell us about that and to provide a few lines of truly representative sample input and the expected output given that input. Commented Jul 18 at 11:42
  • @terdon I added expected output if remove the link from Markdown was not clear enough. Commented Jul 18 at 21:15
  • You still didn't tell us if a title can include (, ], # or ) and so far have only provided 1 sunny-day example of an input line and no similar-looking lines you do not want modified so YMMV with how robust the answers you get are when exposed to your real data. Commented Jul 19 at 12:05