2022年11月18日(金) 2:11 Chet Ramey <chet.ra...@case.edu>: > "If a pattern ends with an unescaped <backslash>, it is unspecified whether > the pattern does not match anything or the pattern is treated as invalid." > > Bash uses the former interpretation. If "the pattern is treated as invalid" > means trying to literally match the open bracket and going on from there, > your interpretation is valid as well. The standard doesn't use that > language in other places it specifies to treat the bracket as an ordinary > character to be matched literally, however.
Thank you for the explanation. I haven't been considering the consistency with the treatment of the slashes outside the bracket expression. I think I need to adjust the treatment of the slash in my new engine by introducing e.g. a special flag for <not matching anything>. Thank you. -- Koichi
