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A general Unicode category or named block. A character in the input string must be a member of a particular Unicode category or must fall within a contiguous range of Unicode characters for a match to succeed. For more information, see Unicode Category or Unicode Block.
A negative general Unicode category or named block. A character in the input string must not be a member of a particular Unicode category or must not fall within a contiguous range of Unicode characters for a match to succeed. For more information, see Negative Unicode Category or Unicode Block.
.NET supports character class subtraction expressions, which enables you to define a set of characters as the result of excluding one character class from another character class. For more information, see Character Class Subtraction.
Character classes that match characters by category, such as \w to match word characters or \p{} to match a Unicode category, rely on the CharUnicodeInfo class to provide information about character categories. In .NET Framework 4.6.2 and later versions, character categories are based on The Unicode Standard, Version 8.0.0.
A positive character group specifies a list of characters, any one of which may appear in an input string for a match to occur. This list of characters may be specified individually, as a range, or both.
where character_group is a list of the individual characters that can appear in the input string for a match to succeed. character_group can consist of any combination of one or more literal characters, escape characters, or character classes.
where firstCharacter is the character that begins the range and lastCharacter is the character that ends the range. A character range is a contiguous series of characters defined by specifying the first character in the series, a hyphen (-), and then the last character in the series. Two characters are contiguous if they have adjacent Unicode code points. firstCharacter must be the character with the lower code point, and lastCharacter must be the character with the higher code point.
Because a positive character group can include both a set of characters and a character range, a hyphen character (-) is always interpreted as the range separator unless it is the first or last character of the group.
The following example defines a positive character group that contains the characters "a" and "e" so that the input string must contain the words "grey" or "gray" followed by another word for a match to occur.
where character_group is a list of the individual characters that cannot appear in the input string for a match to succeed. character_group can consist of any combination of one or more literal characters, escape characters, or character classes.
Because a negative character group can include both a set of characters and a character range, a hyphen character (-) is always interpreted as the range separator unless it is the first or last character of the group.
Two or more character ranges can be concatenated. For example, to specify the range of decimal digits from "0" through "9", the range of lowercase letters from "a" through "f", and the range of uppercase letters from "A" through "F", use [0-9a-fA-F].
A negative character group in a larger regular expression pattern is not a zero-width assertion. That is, after evaluating the negative character group, the regular expression engine advances one character in the input string.
If a regular expression pattern is modified by the RegexOptions.Singleline option, or if the portion of the pattern that contains the . character class is modified by the s option, . matches any character. For more information, see Regular Expression Options.
The following example illustrates the different behavior of the . character class by default and with the RegexOptions.Singleline option. The regular expression ^.+ starts at the beginning of the string and matches every character. By default, the match ends at the end of the first line; the regular expression pattern matches the carriage return character, \r or \u000D, but it does not match \n. Because the RegexOptions.Singleline option interprets the entire input string as a single line, it matches every character in the input string, including \n.
In a positive or negative character group, a period is treated as a literal period character, and not as a character class. For more information, see Positive Character Group and Negative Character Group earlier in this topic. The following example provides an illustration by defining a regular expression that includes the period character (.) both as a character class and as a member of a positive character group. The regular expression \b.*[.?!;:](\s|\z) begins at a word boundary, matches any character until it encounters one of five punctuation marks, including a period, and then matches either a white-space character or the end of the string.
Because it matches any character, the . language element is often used with a lazy quantifier if a regular expression pattern attempts to match any character multiple times. For more information, see Quantifiers.
The Unicode standard assigns each character a general category. For example, a particular character can be an uppercase letter (represented by the Lu category), a decimal digit (the Nd category), a math symbol (the Sm category), or a paragraph separator (the Zl category). Specific character sets in the Unicode standard also occupy a specific range or block of consecutive code points. For example, the basic Latin character set is found from \u0000 through \u007F, while the Arabic character set is found from \u0600 through \u06FF.
matches any character that belongs to a Unicode general category or named block, where name is the category abbreviation or named block name. For a list of category abbreviations, see the Supported Unicode General Categories section later in this topic. For a list of named blocks, see the Supported Named Blocks section later in this topic.
matches any character that does not belong to a Unicode general category or named block, where name is the category abbreviation or named block name. For a list of category abbreviations, see the Supported Unicode General Categories section later in this topic. For a list of named blocks, see the Supported Named Blocks section later in this topic.
Because it matches any word character, the \w language element is often used with a lazy quantifier if a regular expression pattern attempts to match any word character multiple times, followed by a specific word character. For more information, see Quantifiers.
Because it matches any non-word character, the \W language element is often used with a lazy quantifier if a regular expression pattern attempts to match any non-word character multiple times followed by a specific non-word character. For more information, see Quantifiers.
The following example illustrates the \W character class. It defines a regular expression pattern, \b(\w+)(\W){1,2}, that matches a word followed by one or two non-word characters, such as white space or punctuation. The regular expression is interpreted as shown in the following table.
Because the Group object for the second capturing group contains only a single captured non-word character, the example retrieves all captured non-word characters from the CaptureCollection object that is returned by the Group.Captures property.
The following example illustrates the \s character class. It defines a regular expression pattern, \b\w+(e)?s(\s|$), that matches a word ending in either "s" or "es" followed by either a white-space character or the end of the input string. The regular expression is interpreted as shown in the following table.
\S matches any non-white-space character. It is equivalent to the [^\f\n\r\t\v\x85\p{Z}] regular expression pattern, or the opposite of the regular expression pattern that is equivalent to \s, which matches white-space characters. For more information, see White-Space Character: \s.
The following example illustrates the \S language element. The regular expression pattern \b(\S+)\s? matches strings that are delimited by white-space characters. The second element in the match's GroupCollection object contains the matched string. The regular expression can be interpreted as shown in the following table.
\d matches any decimal digit. It is equivalent to the \p{Nd} regular expression pattern, which includes the standard decimal digits 0-9 as well as the decimal digits of a number of other character sets.
The following example illustrates the \D language element. It tests whether a string such as a part number consists of the appropriate combination of decimal and non-decimal characters. The regular expression pattern ^\D\d{1,5}\D*$ is defined as shown in the following table.
You can determine the Unicode category of any particular character by passing that character to the GetUnicodeCategory method. The following example uses the GetUnicodeCategory method to determine the category of each element in an array that contains selected Latin characters. 1e1e36bf2d