Re: Errors indicated by ineffective backslashes in string literals

["Mattias Engdegård" <mattiase@acm.org>]

16 mars 2019 kl. 19.25 skrev Stefan Monnier <monnier@iro.umontreal.ca>:
> 
>> Sorry to bother you again, but while trying to get a better understanding of
>> regexp usage and errors I found several ineffective backslashes in string
>> literals (like "\.") and decided to do something about them.
> 
> I went through something similar "recently" and added the corresponding
> highlighting in elisp-mode (see elisp--font-lock-backslash in lisp-mode.el).

Nice, thank you. I wrote a script to search for the help-echo property to locate the errors.

>> -     (directory-files-recursively store-dir "\.gpg$"))))
>> +     (directory-files-recursively store-dir "\\.gpg$"))))
>                                                      ^
> should be \\'
> 
> [ Yes, I know it's unrelated, but it's another common (minor) error.  ]

Ah yes, sorry, should have done that while at it. Now I searched for such cases and found lots, and decided to postpone it since it's mostly cosmetic -- unless we are concerned about newlines in file names, which we perhaps should be.