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On Mon, Jul 7, 2014 at 9:18 AM, Austin Einter <> wrote:
> Please note that, input string might have some data before or after of given
> example values.

How about something really simple?

local lens = input:match('^Content%-Length%s*:%s+(%d+)%s+$')
if lens then -- gotcha Content-length
   len = tonumber(lens)

Note how '-' must be escaped...%s matches all whitespace, including line ends.