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Determines whether a character is in a character class. 确定字符是否在字符类中。
The expression contained an invalid character class name. 表达式中含有无效的字符类名。
The character class name for graphics characters. 表示图形字符的字符分类名称。
The character class name for word characters. 表示字母字符的字符分类名称。
The character class name for digit characters. 表示数字字符的字符分类名称。
A normal character, a character class, or a parenthesized regular expression. 常规字符、字符类或带括号的正则表达式。
The character class name for alphanumeric characters. 表示字母数字字符的字符分类名称。
The character class name for hexadecimal characters. 表示十六进制字符的字符分类名称。
The character class name for punctuation characters. 表示标点字符的字符分类名称。
The BCL team will include character class subtraction support in the next release of the Framework. BCL团队将在Framework的下一个版本中增加对字符类减法的支持。
A quantifier expression applies to the character, group, or character class that immediately precedes it. 限定符表达式应用于紧挨着它前面的字符、组或字符类。。
Whitespace in the regular expression that isn't inside a character class is ignored. 在正则表达式中不在字符类中的空白符被忽略。
A forward iterator to the start of the character sequence representing the name of the character class. 指向代表字符类名的字符序列始端的一个前向迭代器。
To match a literal "|", use \|, or enclose it inside a character class, as in [|]. 为了匹配字母"|"，可以用\\|，或将其包含在字符类中，如[|]。
In addition to the POSIX-Extended features the escape character is special inside a character class declaration. 对于POSIX扩展特性来说，转义字符在字符类声明中也是特殊的。
Character type functions These functions check whether a character or string falls into a certain character class according to the i current locale. 这些函数根据当前现场的i检查一个字符或字符串是否在一个字符类里面!
Another reason is to group an RE in order to use a repetition operator on the entire RE (as opposed to an individual character or character class). 另一个原因是在整个正则表达式中运用重复操作符(与单个字符或字符集不同)。
There is a vein of melancholy in his character. 他的性格中有少许忧郁的气质。
He looks a suspicious character. 他像个可疑的人。
Second, inside a character class, where there's no use for this assertion, \b represents the backspace character, for compatibility with Python's string literals. 第二个在字符类中，这个限定符（assertion）不起作用，\\b 表示回退符，以便与 Python 字符串兼容。