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Quoting of parentheses in regular expressions



 I'm trying to set up a save-hook to save mails with a certain subject
 to a particular folder.

 The subject line starts with "RC(ci): [string]". Problem is, I cannot get
 any combination of "'\ to recognise the parentheses and square brackets
 as non-special. E.g. neither of

save-hook '~s "RC(ci): [string]"' =bla
save-hook '~s "RC\(ci\): \[string\]"' =bla
save-hook '~s "RC'('ci')': '['string']'"' =bla
save-hook '~s "RC'\('ci'\)': '\['string'\]'"' =bla

 will work. The only version that will work for me is

save-hook '~s "RC.ci.: .string."' =bla

 and it's less than satisfactory. Should I file a bug report for this?
 In any case, the correct syntax is not obvious - the second option above
 is the one that should work according to common sense ;)



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