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I was wondering what characters are considered valid in a Redis key. I have googled for some time and can not find any useful info.
Like in Python, valid variable name should belong to the class [a-zA-Z0-9_]. What are the requirements and conventions for Redis keys?
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Redis Strings Redis Keys are Ideal for Keeping Track of Lots of Strings. For the (simple string) key-value data type Redis allows you to set, get, delete, and increment arbitrary string <key, value> pairs. You can only have 1 value at a time for each key (i.e. set is destructive assignment). You can also delete keys.
Keys in Redis are all strings, so it doesn't really matter what kind of value you pass into a client.
The maximum allowed key size is 512 MB.
To list the keys in the Redis data store, use the KEYS command followed by a specific pattern. Redis will search the keys for all the keys matching the specified pattern. In our example, we can use an asterisk (*) to match all the keys in the data store to get all the keys.
Part of this is answered here, but this isn't completely a duplicate, as you're asking about allowed characters as well as conventions.
As for valid characters in Redis keys, the manual explains this completely:
Redis keys are binary safe, this means that you can use any binary sequence as a key, from a string like "foo" to the content of a JPEG file. The empty string is also a valid key.
A few other rules about keys:
Very long keys are not a good idea, for instance a key of 1024 bytes is a bad idea not only memory-wise, but also because the lookup of the key in the dataset may require several costly key-comparisons. Even when the task at hand is to match the existence of a large value, to resort to hashing it (for example with SHA1) is a better idea, especially from the point of view of memory and bandwidth.
Very short keys are often not a good idea. There is little point in writing "u1000flw" as a key if you can instead write "user:1000:followers". The latter is more readable and the added space is minor compared to the space used by the key object itself and the value object. While short keys will obviously consume a bit less memory, your job is to find the right balance.
Try to stick with a schema. For instance "object-type:id" is a good idea, as in "user:1000". Dots or dashes are often used for multi-word fields, as in "comment:1234:reply.to" or "comment:1234:reply-to".
The maximum allowed key size is 512 MB.
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