--> parsing first single quoted string only.
    str1 = [[var version='1,1,0,0';]]
    res1 = string.match(str1, "%b''")
    res1 = string.gsub(res1, "'", '')
    print(res1)
 
    --> parsing first double quoted string only.
    str2 = [[var version="1,1,0,0";]]
    res2 = string.match(str2, '%b""')
    res2 = string.gsub(res2, '"', "")
    print(res2)
 
 
    --> parsing all single quoted strings.
    line1 = "major_ver='1', minor_ver='1.1'"
    for chunk in string.gmatch(line1, "'(.-)'") do print(chunk) end
 
    --> parsing all double quoted strings.
    line2 = 'major_ver="2", minor_ver="2.2"'
    for chunk in string.gmatch(line2, '"(.-)"') do print(chunk) end
 
    line3 = [[major_ver="3", minor_ver="3.3"]]
    for chunk in string.gmatch(line3, [["(.-)"]]) do print(chunk) end-- your code goes here

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