Is there any way to match keys aligned reg pattern ^[0-9A-Za-z_-]{80}$?

[maomaomqiu]

Hi,
I use below scripts to enumerate keys like -
ZvNQasfj6U6joJUqFopU6xpzqUaoCfdHhvrqMm50lj5UQ0pMMUZFRE1IODNMRDlJNDhLTVNNUFI4My4u

string pattern = "^[0-9A-Za-z_-]{80}$";
await using var keys = server.KeysAsync(pattern: pattern).GetAsyncEnumerator();

Unluckily there find NO keys (Actually those kind of keys exist), I also try with pattern "[0-9A-Za-z_-]{80}", still no work,
Could anyone help suggest proper pattern?

[maomaomqiu]

I try workaround like "Z[0-9A-Za-z_-]{79}$", still no work

[mgravell]

redis pattern matching for keys/scan is not regex - it is glob; the only multiplicity support is ? (any single) vs * (any multiple); untested, but if it needs to be exactly 80, maybe you could try [0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-] (etc, 80 of them)

alternatively, you could perhaps use a glob pattern to do a broad filter, and then apply a secondary regex in the C# code as a fine filter, i.e.

await foreach (var key in server.KeysAsync(pattern: pattern))
{
    if (someRegex.IsMatch(key))
    {
         // more code
    }
}

[mgravell]

just to clarify: the server limitations are out of our hands - if you want to advocate for having regex support for keys/scan, that would be a topic for https://github.com/redis/redis

[maomaomqiu]

Thanks @mgravell , I already try [0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-][0-9A-Za-z_-], not work

[maomaomqiu]

Another question, will ???.. be heavy cost to redis server? @mgravell

[maomaomqiu]

I try ???, it works

[mgravell]

Another question, will ???.. be heavy cost to redis server?

You'd have to measure in your environment, but I wouldn't expect it to be particularly expensive

[maomaomqiu]

Thanks @mgravell , love you!