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+5 A:

\\' matches the empty string at the end of the string/buffer:

http://www.gnu.org/software/emacs/manual/html_node/emacs/Regexp-Backslash.html e l

$ will match the end of the line: If you have newlines in your filename (very uncommon) $ will match the newline and not the end of the string.

The regex is matched against the whole filename, so you need include "/" to match the directory seperator:

(add-to-list 'auto-mode-alist '("/twiki\\.corp" . org-mode))

Jürgen Hötzel 2010-08-16 15:21:21

Thx! What is the purpose of matching an empty string at the end of the string in this case? Is it to ensure that there are no spaces after ".java"? How is it better than using $?

chris 2010-08-16 15:56:40

It is to ensure that you have nothing after the '.java'. Otherwise soemthing like 'somefile.java.not.really' would also match. It's better than '$' if you have a newline in your filename which is unusual but possible. For example a file name like 'bob.java\nsomething else' might be the vector for some malicious attack (though I have no idea what the attack would be).

Ivan Andrus 2010-08-17 13:59:14

I would use the lovely `rx` form, which saves you from having to remember that awful regexp syntax. (You instead have to remember rx's own syntax, but it's lots more readable.)`(rx "/twiki.corp" eos)`

offby1 2010-08-17 16:28:37

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Setting auto-mode-alist in emacs

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