Lua Regex with groups

tproper

If I have a string like this:

local s = "X=5 and Y=2 and X=2 and Z = 4 and B = 4 and X = 9"

How can I parse out all the X values? In other languages you do something along the lines of:

pattern = (X=(\d{1,10}))

and then get all the groups that match.

How can I do this in Gideros Lua?

tproper

Figure it out...goes something like this:

local read_in = "1,2,3"   local numbers = {} local cnt = 0 for n in string.gmatch (read_in, "%d+") do numbers[cnt] = n print("match: " ..n) cnt = cnt + 1 end

SinisterSoft

You should do an article for the blog on this...

tproper

I'm not sure I understand the code well enough to write an article. I only understood it enough to do some simple things.

In the end, I was using the regex to parse a json object but I found LunaJson which does it for me. So I ended up using that. But I am glad I found the regex stuff.

pie

@tproper if you just need to read and write json files gideros has a native json plugin http://docs.giderosmobile.com/reference/plugin/json
From the project tree on the left, right-click on Plugins and add it - keep in mind that if you need to test on device you will need to build your own player.

hgy29

Json plugin is usually included in prebuilt players

tproper

Oh, wow. Cool. I'll look into that.