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# Character Classes

**.NET Framework 1.1**

A character class is a set of characters that will find a match if any one of the characters included in the set matches. The following table summarizes character matching syntax.

Character class | Description |
---|---|

. | Matches any character except \n. If modified by the Singleline option, a period character matches any character. For more information, see Regular Expression Options. |

[aeiou] | Matches any single character included in the specified set of characters. |

[^aeiou] | Matches any single character not in the specified set of characters. |

[0-9a-fA-F] | Use of a hyphen (`–` ) allows specification of contiguous character ranges. |

\p{name} | Matches any character in the named character class specified by {name}. Supported names are Unicode groups and block ranges. For example, Ll, Nd, Z, IsGreek, IsBoxDrawing. |

\P{name} | Matches text not included in groups and block ranges specified in {name}. |

\w | Matches any word character. Equivalent to the Unicode character categories`[\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]` . If ECMAScript-compliant behavior is specified with the ECMAScript option, \w is equivalent to [a-zA-Z_0-9]. |

\W | Matches any nonword character. Equivalent to the Unicode categories `[^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]` . If ECMAScript-compliant behavior is specified with the ECMAScript option, \W is equivalent to [^a-zA-Z_0-9]. |

\s | Matches any white-space character. Equivalent to the Unicode character categories `[\f\n\r\t\v\x85\p{Z}]` . If ECMAScript-compliant behavior is specified with the ECMAScript option, \s is equivalent to [ \f\n\r\t\v]. |

\S | Matches any non-white-space character. Equivalent to the Unicode character categories `[^\f\n\r\t\v\x85\p{Z}]` . If ECMAScript-compliant behavior is specified with the ECMAScript option, \S is equivalent to [^ \f\n\r\t\v]. |

\d | Matches any decimal digit. Equivalent to \p{Nd} for Unicode and [0-9] for non-Unicode, ECMAScript behavior. |

\D | Matches any nondigit. Equivalent to \P{Nd} for Unicode and [^0-9] for non-Unicode, ECMAScript behavior. |

You can find the Unicode category a character belongs to with the method GetUnicodeCategory.

For more information on Unicode character categories, see the document ** Unicode Data File Format**, available on the Unicode Technical Committee's (UTC) Web site at http://www.unicode.org/Public/UNIDATA/UnicodeData.html.

#### See Also

Regular Expression Language Elements | GetUnicodeCategory | Regular Expression Options

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