# Example `sipscan.lua`

    -- another SIP example, shows how an awkward log file format

    -- can be parsed. It also prints out the actual Lua string

    -- pattern generated:

    -- SYNC%s*%[([+%-%d]%d*)%]%s*([+%-%d]%d*)%s*([+%-%d]%d*)

    require 'pl'

    s = [[

    SYNC [1] 0 547 (14679 sec)

    SYNC [2] 0 555 (14679 sec)

    SYNC [3] 0 563 (14679 sec)

    SYNC [4] 0 571 (14679 sec)

    SYNC [5] -1 580 (14679 sec)

    SYNC [6] 0 587 (14679 sec)

    ]]

    local first = true

    local start

    local res = {}

    local pat = 'SYNC [$i{seq}] $i{diff} $i{val}'

    print(sip.create_pattern(pat))

    local match = sip.compile(pat)

    for line in stringx.lines(s) do

      if match(line,res) then

        if first then

          expected = res.val

          first = false

        end

        print(res.val,expected - res.val)

        expected = expected + 8

      end

    end

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