2

What does this mean:

RewriteRule "(^|/)\." - [F]

I know the F flag means to throw a 403 forbidden error. And I know the escaped period means that directories starting with a period are forbidden. But what is the meaning of the caret, pipe and slash within the parenthesis? What would be the difference between the statement above and this one:

RewriteRule "\." - [F]

What if I wanted to flag URLs as forbidden when they start with a period but with an exception for this directory:

.well-known

Update: It looks like I can satisfy the latter requirement with...

RewriteRule "(^|/)\.(?!well-known)" - [F]

I'm still wondering what is the meaning of the caret, pipe and slash within the parenthesis.

4
  • The caret usually signifies the beginning (of a string or line or variable etc) and I think the | is an OR, so it would be looking for ^. a full stop at the beginning (root) or /. in the middle. (but making a full stop in another place ok - /sksks.sks/okplace)
    – Smock
    Nov 11, 2019 at 16:03
  • Does (^|/) mean something like "nothing at all or a forward slash"? If so, why would we need to express the "nothing at all" part?
    – arnoldbird
    Nov 11, 2019 at 16:22
  • 1
    For root folders beginning with a . with no leading / ?
    – Smock
    Nov 11, 2019 at 16:23
  • "directories starting with a period are forbidden" - more commonly files (eg. .htaccess). But in reality any URL-path segment that starts with a period (which may or may not map to a physical file or directory). Unless you have specific dot-files you need to block access (which is best done with a <FilesMatch> container and mod_authz_core) then this directive may not be required anyway? The server should already have directives that block .htaccess and .htpasswd-like files.
    – MrWhite
    Nov 11, 2019 at 17:21

1 Answer 1

0

^ and $ are special characters that represent the beginning and end of strings (or lines)

the | is an OR symbol

(^|/)\. expands to ^. or /. (without escaping slash for clarity)

^. = any string that has a . as the first character

/. = any string with a /.

2
  • I was editing this while you were ArnoldBird - it says the edits conflicted - Please go ahead and edit now if still needed.
    – Smock
    Nov 11, 2019 at 16:41
  • Is it worth adding the part of the answer you found yourself? (about all forbidden except <x>)
    – Smock
    Nov 11, 2019 at 16:43

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .