Filter Meta characters in the input while validating it.
在验证的同时过滤输入中的Meta字符。
Characters with codes higher than 127 will be preceded with m - as in "meta", which is an equivalent of Alt - characters on other systems.
对于代码大于127的字符，它们的前面将会被加上m -(表示“meta”)，这与其它系统中在字符前面加上Alt -相当。
What do the other Meta characters do?
什么其他元字符怎么办？
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