【入门夯实】字符串查找的起点参数：find的init与plain双参数

local record = "烈火剑法+7,裁决之杖+5,烈火剑法+3"
local pos = string.find(record, "烈火剑法")
local pos2 = string.find(record, "烈火剑法")

local record = "烈火剑法+7,裁决之杖+5,烈火剑法+3"
local function findAll(s, sub)
    local hits = {}
    local from = 1
    while from <= #s do
        local p = string.find(s, sub, from, true)
        if not p then
            break
        end
        hits[#hits + 1] = p
        from = p + #sub
    end
    return hits
end
local hits = findAll(record, "烈火剑法")

local p1 = string.find(record, "烈火剑法")
local p2 = string.find(record, "烈火剑法", p1 + 4, true)

local rev = string.reverse(record)
local pr = string.find(rev, "烈火剑法", 1, true)
local origin = #record - pr - #"烈火剑法" + 3