FileOpen + foreign syntax + converting to an array?

I have a file that changes somewhat frequently (at least 5 times when this section of my script runs) and I want my script to capture some data from it. The file is much longer, but I have copied the syntax completely with two entries. Every time the file is written it writes the entries in random order, so next time the script reads the file entry yyy could be above xxx. The only two variables I need to work with are "value2" and "value3". The file changes so much that I'm not even sure if it makes sense to convert it into an array, but this is a small part of my FIRST script so I'm a total newb. (I'm pretty excited about what I have learned so far, I have started to work with arrays, and my script is connecting to a remote mysql database and doing some other fun stuff).

The script will have "xxx" and needs to find the number corresponding to it. What's worse (for me) is that it doesn't need the last 4 digits of the number. So the value currently associated with "xxx" is actually "24687". I'm not afraid to read, but I'd like some advice from some experienced people to point me at the right direction.

aaa = {
["xxx_bbb::zzz"] = {
["value1"] = true,
["value2"] = "xxx",
["value3"] = 246870316,
},
["yyy_ccc::zzz"] = {
["value1"] = true,
["value2"] = "yyy",
["value3"] = 32608358,
},
}