... 正规字符 regular character 正规字符代码 regular character code 正号穿孔 plus punch ...
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Unicode character class specifiers, arbitrary code execution inside a pattern, flag toggles, conditional expressions, and many other features were added to the regular expression engine.
Unicode字符集、模式内任意代码操作、flag toggles、条件表达式以及其他特征都被添加到正则表达式库中。
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