我的目标是找到一个类似于下面这样的模式，

  space channel space

我想要剪掉文本块（页）的开头和结尾。

我在 Lua 中编写了以下代码。我的下面的代码只适用于一个字母的模式。

我应该如何使它适用于任何具有此 space word space 模式的单词，该模式应裁剪出出现在 页面开头和结尾的数组索引值？

singleChar = ' and third party cookies (such as the DoubleClick cookie) together to (a) inform, optimize and serve ads based on a users past visits to '

totaLen = string.len(singleChar)

totalen = -totaLen

print('actual singleChar - '..singleChar)

singleCharChecking = string.sub(singleChar,-2,-1)

print ('singleCharChecking - '..singleCharChecking)

checkPattern = string.gmatch(singleCharChecking,"%s%a")

for word in checkPattern do
    checkPatternLen = string.len(word)
    print(checkPatternLen)
    if (checkPatternLen == 2) then
        singleChar = string.sub(singleChar,totalen,-2)
        print('single char - '..singleChar)
    end
end

输入：singleChar = ' and third party cookies (such as the DoubleClick cookie) together to (a) inform, optimize and serve ads based on a users past visits to '

期望的输出： third party cookies (such as the DoubleClick cookie) together to (a) inform, optimize and serve ads based on a users past visits