【高级技巧】模式预编译：高频pattern的常量表治理

local P = {
    war = "^(%d+):(%d+):(%d+)%s+(%S+)%s+(%S+)%s+(%d+)$",
}
local function parseByPattern(lines)
    local rows = {}
    for i = 1, #lines do
        local h, m, s, guild, act, dmg = string.match(lines[i], P.war)
        rows[i] = { h = h, guild = guild, dmg = tonumber(dmg) or 0 }
    end
    return rows
end

local function parseByScan(lines)
    local rows = {}
    for i = 1, #lines do
        local s = lines[i]
        local p1 = string.find(s, " ", 1, true)
        local p2 = string.find(s, " ", p1 + 1, true)
        local guildFrom = string.find(s, " ", p2 + 1, true)
        rows[i] = { guild = string.sub(s, p2 + 1, guildFrom - 1),
            dmg = tonumber(string.sub(s, guildFrom + 1)) or 0 }
    end
    return rows
end