模式匹配

01.

print(string.find("Hellow world","l",4 )) --44

截取字符串

info = "我是小菜鸟"
local str = string.sub(info,index,endIndex)
-- info  字符串信息
--index 开始截取的字的索引
--endIndex 结束时的索引
 
print(string.sub(info,1,6))
--我是
print(string.sub("Hellowworld",1,3 )) --Hel

print(string.find( "5898{5wd","{",1,true )) --5 5

print(string.gsub("5898{5wd","wd" ,"666"))

04.截取字符串为表

function string.split(input, delimiter)
    if not input or string.len(input) == 0 or not delimiter or string.len(delimiter) == 0 then
        return {}
    end

    input = tostring(input)
    delimiter = tostring(delimiter)
    local pos, arr = 0, {}
    for st, sp in function()
        return string.find(input, delimiter, pos, true)
    end do
        table.insert(arr, string.sub(input, pos, st - 1))
        pos = sp + 1
    end
    table.insert(arr, string.sub(input, pos))
    return arr
end
local tab=string.split("dfd[pf[gpl","[")
for i=1,#tab do
    print(tab[i])
end

05.string.gmatch

local str = "123=sd456=,ff,45="
local str1 = string.gmatch(str, "(%d+)") 
print(str1())    -- 123
print(str1())    -- 456
print(str1())    -- 45
local s="some-s-tring-" 
local words=
{

}
for w in string.gmatch( s,"(%a+)-") do
    print(w)
end
some
s
tring