C#正则表达式匹配字母、数字和下划线
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C# Regular Expression to match letters, numbers and underscore
提问by user70192
I am trying to create a regular expression pattern in C#. The pattern can only allow for:
我正在尝试在 C# 中创建一个正则表达式模式。该模式只能允许：
- letters
- numbers
- underscores
- 字母
- 数字
- 下划线
So far I am having little luck (i'm not good at RegEx). Here is what I have tried thus far:
到目前为止，我运气不佳（我不擅长 RegEx）。这是我迄今为止尝试过的：
// Create the regular expression
string pattern = @"\w+_";
Regex regex = new Regex(pattern);
// Compare a string against the regular expression
return regex.IsMatch(stringToTest);
采纳答案by Tolgahan Albayrak
EDIT :
编辑 ：
@"^[a-zA-Z0-9\_]+$"
or
或者
@"^\w+$"
回答by Byron Ross
Try experimenting with something like http://www.weitz.de/regex-coach/which lets you develop regex interactively.
It's designed for Perl, but helped me understand how a regex works in practice.
尝试尝试像http://www.weitz.de/regex-coach/这样的东西，它可以让你交互式地开发正则表达式。
它是为 Perl 设计的，但帮助我理解了正则表达式在实践中是如何工作的。
回答by Joe White
@"^\w+$"
@"^\w+$"
\w matches any "word character", defined as digits, letters, and underscores. It's Unicode-aware so it'll match letters with umlauts and such (better than trying to roll your own character class like [A-Za-z0-9_] which would only match English letters).
\w 匹配任何“单词字符”，定义为数字、字母和下划线。它是 Unicode 感知的，因此它会将字母与变音符号等匹配（比尝试滚动您自己的字符类更好，例如 [A-Za-z0-9_] 只匹配英文字母）。
The ^ at the beginning means "match the beginning of the string here", and the $ at the end means "match the end of the string here". Without those, e.g. if you just had @"\w+", then "@@Foo@@" would match, because it containsone or more word characters. With the ^ and $, then "@@Foo@@" would not match (which sounds like what you're looking for), because you don't have beginning-of-string followed by one-or-more-word-characters followed by end-of-string.
开头的 ^ 表示“匹配这里字符串的开头”，末尾的 $ 表示“匹配这里字符串的结尾”。没有这些，例如，如果您只有@"\w+"，那么"@@Foo@@" 将匹配，因为它包含一个或多个单词字符。使用 ^ 和 $，则“@@Foo@@”将不匹配（这听起来像您要查找的内容），因为您没有字符串开头后跟一个或多个单词-字符后跟字符串结尾。
回答by Krushik
Regex
正则表达式
packedasciiRegex = new Regex(@"^[!#$%&'()*+,-./:;?@[\]^_]*$");
