我希望我的域名不包含超过一个连续的 (.)、'/' 或任何其他特殊字符。但它可以包含 IDN 字符，例如 Á、ś 等。。我可以通过使用此正则表达式来满足所有要求(IDN 除外):
@"^(?:[a-zA-Z0-9][a-zA-Z0-9-_]*\.)+[a-zA-Z0-9]{2,}$";
问题是这个正则表达式也拒绝 IDN 字符。我想要一个允许 IDN 字符的正则表达式。我做了很多研究，但我无法弄明白。
最佳答案
简介
Regex 包含一个字符类，允许您指定 Unicode 通用类别 \p{}。 MSDN regex documentation包含以下内容:
\p{ name }Matches any single character in the Unicode general category or named block specified by name.
此外，作为旁注，我注意到您的正则表达式包含未转义的 .。在正则表达式中，点字符 . 具有任何字符的特殊含义(除非另有说明，否则换行符除外)。您可能需要将其更改为 \. 以确保正常运行。
代码
编辑现有代码以包含 Unicode 字符类而不是简单的 ASCII 字母，您应该实现以下目标:
^(?:[\p{L}\p{N}][\p{L}\p{N}-_]*.)+[\p{L}\p{N}]{2,}$
解释
\p{L}表示任何语言/文字的任何字母的 Unicode 字符类\p{N}表示任何语言/脚本中任何数字的 Unicode 字符类(根据您的字符样本，您可以保留0-9，但我想我会向您展示一般概念并为您提供一些额外的信息)
This site给出了最常用的 Unicode 类别的快速概览。
\p{L}or\p{Letter}: any kind of letter from any language.
\p{Ll}or\p{Lowercase_Letter}: a lowercase letter that has an uppercase variant.\p{Lu}or\p{Uppercase_Letter}: an uppercase letter that has a lowercase variant.\p{Lt}or\p{Titlecase_Letter}: a letter that appears at the start of a word when only the first letter of the word is capitalized.\p{L&}or\p{Cased_Letter}: a letter that exists in lowercase and uppercase variants (combination of Ll, Lu and Lt).\p{Lm}or\p{Modifier_Letter}: a special character that is used like a letter.\p{Lo}or\p{Other_Letter}: a letter or ideograph that does not have lowercase and uppercase variants.\p{M}or\p{Mark}: a character intended to be combined with another character (e.g. accents, umlauts, enclosing boxes, etc.).
\p{Mn}or\p{Non_Spacing_Mark}: a character intended to be combined with another character without taking up extra space (e.g. accents, umlauts, etc.).\p{Mc}or\p{Spacing_Combining_Mark}: a character intended to be combined with another character that takes up extra space (vowel signs in many Eastern languages).\p{Me}or\p{Enclosing_Mark}: a character that encloses the character is is combined with (circle, square, keycap, etc.).\p{Z}or\p{Separator}: any kind of whitespace or invisible separator.
\p{Zs}or\p{Space_Separator}: a whitespace character that is invisible, but does take up space.\p{Zl}or\p{Line_Separator}: line separator character U+2028.\p{Zp}or\p{Paragraph_Separator}: paragraph separator character U+2029.\p{S}or\p{Symbol}: math symbols, currency signs, dingbats, box-drawing characters, etc.
\p{Sm}or\p{Math_Symbol}: any mathematical symbol.\p{Sc}or\p{Currency_Symbol}: any currency sign.\p{Sk}or\p{Modifier_Symbol}: a combining character (mark) as a full character on its own.\p{So}or\p{Other_Symbol}: various symbols that are not math symbols, currency signs, or combining characters.\p{N}or\p{Number}: any kind of numeric character in any script.
\p{Nd}or\p{Decimal_Digit_Number}: a digit zero through nine in any script except ideographic scripts.\p{Nl}or\p{Letter_Number}: a number that looks like a letter, such as a Roman numeral.\p{No}or\p{Other_Number}: a superscript or subscript digit, or a number that is not a digit 0–9 (excluding numbers from ideographic scripts).\p{P}or\p{Punctuation}: any kind of punctuation character.
\p{Pd}or\p{Dash_Punctuation}: any kind of hyphen or dash.\p{Ps}or\p{Open_Punctuation}: any kind of opening bracket.\p{Pe}or\p{Close_Punctuation}: any kind of closing bracket.\p{Pi}or\p{Initial_Punctuation}: any kind of opening quote.\p{Pf}or\p{Final_Punctuation}: any kind of closing quote.\p{Pc}or\p{Connector_Punctuation}: a punctuation character such as an underscore that connects words.\p{Po}or\p{Other_Punctuation}: any kind of punctuation character that is not a dash, bracket, quote or connector.\p{C}or\p{Other}: invisible control characters and unused code points.
\p{Cc}or\p{Control}: an ASCII or Latin-1 control character: 0x00–0x1F and 0x7F–0x9F.\p{Cf}or\p{Format}: invisible formatting indicator.\p{Co}or\p{Private_Use}: any code point reserved for private use.\p{Cs}or\p{Surrogate}: one half of a surrogate pair in UTF-16 encoding.\p{Cn}or\p{Unassigned}: any code point to which no character has been assigned.
关于c# - 包括 IDN 字符的域名正则表达式 c#，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47514123/