I have a caching system I need to bypass if the user's name (in a cookie) is found in the $request_uri. I'm trying to do something like this, but can't get the variable to interpolate into the regex. Any suggestions pretty please?
I can set the $me variable just fine from the cookie; I just can't get it to interpolate into the regex.
set $chk == "need";
set $me "kevin";
if ($uri ~ $me) { set $chk ""; }
if ($chk == "need") { rewrite ^ /testing }
I've always tried things like this:
if ($uri ~ "by-{$me}") { set $chk ""; }
Thanks! -Kevin
2 Answers
It's not exactly what I asked, but I think it'll work for my purposes. I'm still curious how to interpolate a variable inside a nginx PCRE regex if anyone else knows!
set $chk == "need";
set $me "kevin";
if ($uri ~ /by-([^-]+)/) { set $by $1; }
if ($by = $me) {set $chk "";}
It's possible to incorporate a variable within a regex expression by just putting $ in front of the variable ... no need to do ${}
so I suppose in your case
if ($uri ~ "by-$me") { set $chk ""; }
the regular expression will then be equal to by-kevin
I've had it work like this for a more complex regex rule
where I wanted orgin to match a list of possible domain names
set $domainWhitelist "yahoo\.com|google\.com|foo\.com";
if ($http_origin ~* "https?://([\w-]*\.)*($domainWhitelist)(:\d+)?") {
...
}
