在LUA 5.1中如何分隔字符串中没有空格的表情符号

local str = "Hello!😀This,is;a:test."
local expressions = {}

for expression in string.gmatch(str, "[%p]") do
    table.insert(expressions, expression)
end

for i, expression in ipairs(expressions) do
    print("Expression #" .. i .. ": " .. expression)
end

Expression #1: !
Expression #2: 😀
Expression #3: ,
Expression #4: ;
Expression #5: :
Expression #6: .

local str = "Hello!😀This,is;a:test."
local expressions = {}

local i = 1
while i <= #str do
    local expressionStart, expressionEnd = string.find(str, "[^\128-\193][\128-\191]*", i)
    if expressionStart then
        local expression = string.sub(str, expressionStart, expressionEnd)
        table.insert(expressions, expression)
        i = expressionEnd + 1
    else
        i = i + 1
    end
end

for i, expression in ipairs(expressions) do
    print("Expression #" .. i .. ": " .. expression)
end