this post was submitted on 12 Nov 2023
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Elisp regular expressions are case insensitive by default, so they should match uppercase letters too.
To just add a dash, you could simply put that into the second group. So
[a-z0-9-]
, you don’t have to escape it because it can’t be a range operator if it’s at the end of the group. The same goes for any other character you want to match.You could also use
[\\w. _-]
(notice the literal space between the dot and the underscore). The\w
is a shorthand forA-Za-z0-9
. This should match all valid filenames as long as they don’t contain letters with diacritics.