【入门夯实】多段解析：string.find的起点参数与循环查找

local function parseBad(s)
    local first = string.find(s, ";")
    local second = string.find(s, ";")
    return first, second
end

local function parsePairs(actor, s)
    actor = getplayerbyname(actor)
    local pos = 1
    while true do
        local from, to = string.find(s, ";", pos, true)
        local seg = string.sub(s, pos, (from or 0) - 1)
        if seg ~= "" then
            local k, v = string.match(seg, "^(%w+)=(%w+)$")
            if k then
                sendmsg(actor, 1, k .. " 的值是 " .. v)
            end
        end
        if from == nil then
            break
        end
        pos = to + 1
    end
end

local function countSep(s, sep)
    local cnt, pos = 0, 1
    while true do
        local from = string.find(s, sep, pos, true)
        if from == nil then
            return cnt
        end
        cnt = cnt + 1
        pos = from + #sep
    end
end