Capture patterns

I’m trying to understand the PiL, 2^nd Edition, page 184 where it talks about capture patterns when the string to be captured is quoted. My objective is to capture this string minus the quotes. I used the sample patterns provided and received errors. I altered the first pattern, and was able to get it to work. I understand the second pattern is superior, but I can not get it to function. I do not have a Unix or regex background, so your patience is appreciated. This is WinXP based Lua.

The sample code is attached and listed below.

-- test code based on PiL, page 184

local abc = "name " .. '"' .. "abc123" .. '"' .. " more data"

--local xyz = string.match(abc, '[\"'].-[\"']')

local cap = '[\"' .. "']"

cap = cap .. "(.-)" .. cap

local cap2 = '([\"'

cap2 = cap2 .. "'])"

cap2 = cap2 .. "(.-)%1"

local xyz = string.match(abc, cap)

local klm = string.match(abc, "([\"'])(.-)%1")

local rst = string.match(abc, '([\"])(.-)([\"])')

local pqr = string.match(abc, cap2)

print(abc, "**Verify String is correct**")

print(klm, "First")

print(rst, "Second")

print(xyz, "Third")

print(pqr, "Fourth")

-- Test case 3 gets desired results

-- Lua is 5.1.2

I could not get the commented-out code to compile. Any ideas on what I’m doing wrong?