lua string扩展

lua string常用附加函数

string.split = function(s, delim)
    local split = {}
    local pattern = "[^" .. delim .. "]+"
    string.gsub(s, pattern, function(v) table.insert(split, v) end)
    return split
end

string.ltrim = function(s, c)
    local pattern = "^" .. (c or "%s") .. "+"
    return (string.gsub(s, pattern, ""))
end

string.rtrim = function(s, c)
    local pattern = (c or "%s") .. "+" .. "$"
    return (string.gsub(s, pattern, ""))
end

string.trim = function(s, c)
    return string.rtrim(string.ltrim(s, c), c)
end

string.split_to_number = function(s, delim)
    local split = {}
    local pattern = "[^" .. delim .. "]+"
    string.gsub(s, pattern, function(v) table.insert(split, tonumber(v)) end)
    return split
end

 

string格式化一例:

local idStr = string.format("%08x", 15) --把数字15用16进制输出, 占8位, 不足前面补0
print(idStr)  -- 输出 0000000f