Redis SCAN by "regex"
scanregex.lua
| foo@bar:~$ redis-cli | |
| 127.0.0.1:6379> dbsize | |
| (integer) 0 | |
| 127.0.0.1:6379> set user:1 1 | |
| OK | |
| 127.0.0.1:6379> set use:the:force luke | |
| OK | |
| 127.0.0.1:6379> set non:user a | |
| OK | |
| foo@bar:~$ redis-cli --eval scanregex.lua , "^user" | |
| 1) "user:1" | |
| foo@bar:~$ redis-cli --eval scanregex.lua , "^user" 1 | |
| 1) "use:the:force" | |
| 2) "non:user" |
| --[[ | |
| Use SCAN to search the entire keyspace and filter keys | |
| with Lua patterns which are not POSIX regex, but ATM | |
| (v3) the best thing available in Redis. | |
| KEYS: none | |
| ARGV: 1: Lua pattern (defaults to .* if unprovided) | |
| 2: Complement switch (i.e. not) | |
| ]]-- | |
| local re = ARGV[1] | |
| local nt = ARGV[2] | |
| local cur = 0 | |
| local rep = {} | |
| local tmp | |
| if not re then | |
| re = ".*" | |
| end | |
| repeat | |
| tmp = redis.call("SCAN", cur, "MATCH", "*") | |
| cur = tonumber(tmp[1]) | |
| if tmp[2] then | |
| for k, v in pairs(tmp[2]) do | |
| local fi = v:find(re) | |
| if (fi and not nt) or (not fi and nt) then | |
| rep[#rep+1] = v | |
| end | |
| end | |
| end | |
| until cur == 0 | |
| return rep |