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\{or\}. If so, it's not obvious how it's doing that so would you mind editing your answer to add an explanation for that part of the sed script? I THINK it's the((\\.|[^{}\\])*)part of the regexp that's doing it but I don't see why that'd work.\\SomeStyle{something}already noted.\\.matches any escaped character so it'd match\\if\\{were present (so handling all pairs of contiguous\s that might exist before a{) or match\{if that were present but not as part of\\{(so handling a truly escaped{). Then[^{}\\]matches any singe character other than{,}or\. Putting that inside(...)*provides 0-or-more repetition so I don't see yet why that wouldn't accommodate\\SomeStyle{something}.