Imagine a string, like 'Agh#$%#%2341- -!zdrkfd' and I only wish to perform some operating on it such that only the lowercase letters are returned (as an example), which in this case would bring 'ghzdrkfd'.Imagine a string, like 'Agh#$%#%2341- -!zdrkfd'
阅读背景：
如何过滤字符串，只返回列表中的字符？
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