metacharacter

[US]/ˈmetəkærəktə/
[UK]/ˈmetəkærəktər/

Translation

n. 一个在正则表达式或其他模式匹配上下文中具有特殊含义的字符,与字面字符相反;一个在形式语言中代表运算符或命令的符号,而不是字面值。
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