Score:1

Server

Nginx location matching with regex year/month/day/*

TELA

10/13/22, 12:11 AM

I have some old url pattern to redirect to new location in nginx.

A typical clean url looks like example.com/2021/06/13/78676.html?..

Im roughly trying to match number of digit in each block like:

location ~ "^[0-9]{4}/[0-9]{2}/[0-9]{2}/([0-9]+).html" {
   rewrite ^ /archive.php?q=$1;
}

Where exactly Im going wrong please..

759

1 + 2

nginx

regex

Michael Hampton

10/13/22, 12:12 AM

What is the problem you are having?

TELA

10/13/22, 12:39 AM

Oops! forgive me. I forgot to comment out Certbot's 'return 404' directive at the end of file. I was applying this redirection for non https pages. everything works fine. Thank you

Score:2

Server

Richard Smith

10/13/22, 7:03 AM

The first issue is that all Nginx URIs begin with a leading /. So your regular expression will never match.

The second issue is that numeric captures are overwritten whenever a new regular expression is evaluated. So in your configuration, $1 will always be empty.

You could use a named capture:

location ~ "^/[0-9]{4}/[0-9]{2}/[0-9]{2}/(?<value>[0-9]+)\.html" {
    rewrite ^ /archive.php?q=$value last;
}

Alternatively, place the numeric capture in the rewrite statement:

rewrite "^/[0-9]{4}/[0-9]{2}/[0-9]{2}/(?<value>[0-9]+)\.html" /archive.php?q=$1 last;

Or use a try_files statement instead of rewrite:

location ~ "^/[0-9]{4}/[0-9]{2}/[0-9]{2}/([0-9]+)\.html" {
    try_files nonexistent /archive.php?q=$1;
}

0 + 2

TELA

10/13/22, 10:08 PM

I found there is an issue with named capture too if someone pass a GET variable 'q' along with the request url like /2021/06/13/78676.html?a=1&q=asdf . In that case even named value seems overwritten by new $q = asdf. Any workaround ?

Richard Smith

10/14/22, 6:36 AM

If you want to keep the other parameters (like `a=1`) it gets tricky. Otherwise, use a trailing `?` in the replacement value in the `rewrite` statement and the original arguments will **not** be appended. For example: `rewrite ^ /archive.php?q=$value? last;` - see [this document](http://nginx.org/en/docs/http/ngx_http_rewrite_module.html#rewrite).

Jesse Nickles

9/12/23, 8:49 AM

Btw repeating a point discussed elsewhere, ensure you use double quotes on such regex strings that contain curly brackets otherwise it will not work... also there should be no need to end the string with any `$` sign either.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Nginx location matching with regex year/month/day/*

TH: ตำแหน่ง Nginx ตรงกับ regex ปี/เดือน/วัน/*

RO: Locația Nginx se potrivește cu regex an/lună/zi/*

RU: Сопоставление местоположения Nginx с регулярным выражением год/месяц/день/*

VI: Vị trí Nginx khớp với regex năm/tháng/ngày/*

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