[英]Regular expression to check url and shared file path
I'm using below regular expression for Dataform field for checking whether the entered text starts with http://
or https://
or \\\\
我正在使用Dataform字段的正则表达式下面检查输入的文本是以http://
或https://
还是\\\\
开头
I'm using System.componentmodel.DataAnnotations.RegularExpressionAttribute 我正在使用System.componentmodel.DataAnnotations.RegularExpressionAttribute
[Display(Name = "URL", Description = "URL")]
[RegularExpression(@"^(http[s]{0,1}:\/\/|\\\\)",
ErrorMessage = "Please enter valid Url or filepath")]
public string URL { get; set; }
but in dataform field it is throwing error if any text is enetered after http:// or https:// or \\\\ 但是在dataform字段中,如果在http://或https://或\\\\之后存在任何文本,则会抛出错误
http://google.com ---failed
https://aa --failed
\\a ----failed
I just want to pass all the above scenarios ...on high level the regular expression should just only check whether entered text starts with http://
or https://
or \\\\
我只想传递上述所有场景......在高级别上,正则表达式应仅检查输入的文本是以http://
或https://
还是\\\\
开头
And even dataform is throwing error for the field when user enters and delete the text and click on tab.the error is URL is required field , but I didn't mention required attribute for this property. 甚至当用户输入和删除文本并单击选项卡时,数据形式也会为该字段抛出错误。错误是URL是必填字段 ,但我没有提到此属性的必需属性。 Please help 请帮忙
You are using a literal string, but you're trying to escape it. 您正在使用文字字符串,但您正试图逃避它。
[RegularExpression(@"^(http[s]{0,1}:\/\/|\\\\)",
A literal string starts with @"..."
and don't need to be escaped. 文字字符串以@"..."
开头,不需要转义。 So either use 所以要么使用
[RegularExpression("^(http[s]{0,1}://|[\\\\]{2})(?:[\\w][\\w.-]?)",
or 要么
[RegularExpression(@"^(http[s]{0,1}://|[\\]{2})(?:[\w][\w.-]?)",
Update: You can also read more about string literals on MSDN: String Literals 更新:您还可以在MSDN上阅读有关字符串文字的更多信息: String Literals
Update 2: It is a common error, and / doesn't have to be escaped in C# neither, it is the perl syntax. 更新2:这是一个常见错误,并且/不必在C#中进行转义,它是perl语法。 In perl (and PHP which uses perl regex estension, all the preg_xxx methods), one has to set a delimiter. 在perl(以及使用perl regex estension,所有preg_xxx方法的PHP)中,必须设置分隔符。 In this languages the regex will begin with a delimiter, which is an symbol that shows the begin and the end of the regex pattern, ie 在这种语言中,正则表达式将以分隔符开始,分隔符是显示正则表达式模式的开始和结束的符号,即
/^(http[s]?:\\/\\/... /i
The first / is a delimiter, that's why // from http:// has to be escaped. /^(http[s]?:\\/\\/... /i
第一个/是分隔符,这就是为什么//来自http://必须进行转义。
#^(http[s]?://... #i
The first # is now the delimiter, that's why // from http:// doesn't have to be escaped. The instruction after the delimiter (ie i in this case) just tells to do a case insensitive match #^(http[s]?://... #i
第一个#现在是分隔符,这就是为什么//从http://不必转义。分隔符后的指令(即我在这种情况)只是告诉做一个不区分大小写的匹配
Some example I used to test it: 我用来测试它的一些例子:
string[] inputs = { @"http://google.com", @"https://aa", @"\\a", @"\\\a" };
Regex regEx = new Regex(@"^(http[s]{0,1}://|[\\]{2})(?:[\w][\w.-]?)+", RegexOptions.Compiled);
foreach(var input in inputs) {
var match = regEx.Match(input);
Console.WriteLine(string.Format("{0}:\t{1} => {2}", input, match.Success, match.Success?match.Groups[1].Value:string.Empty));
}
The (?:[\\w][\\w.-]?)+
at the end is to make sure, it that a word followed by a words, ie \\\\a shouldn't be valid, neither should http://.somedomain.com
最后的(?:[\\w][\\w.-]?)+
是为了确保一个单词后跟一个单词,即\\\\ a应该无效, http://.somedomain.com
也不应该http://.somedomain.com
Result: 结果:
http://google.com: True
https://aa: True
\\a: True
\\\a: False
They didn't fail for me. 他们没有为我失败。 I checked it with RegEx.IsMatch(). 我用RegEx.IsMatch()检查了它。
But if you want to check for a double \\ at the beginning your regex should be ^(http[s]{0,1}://|\\\\) 但是如果你想在开头检查一个双\\ \\你的正则表达式应该是^(http [s] {0,1}:// | \\\\)
You can try 你可以试试
^(http[s]?://|\\\\)
which is actually equal to your Regex. 这实际上等于你的正则表达式。
When you want the regex to be capital insensitive use: 当您希望正则表达式对资本不敏感时使用:
(?i)^(http[s]?://|\\\\)
or 要么
(?i)^(http[s]?://|\\\\).+$
Addition: 加成:
I have tried this in my MVC 4 application and it works: 我在我的MVC 4应用程序中尝试了这个并且它可以工作:
/// <summary>
/// Gets or sets the website.
/// </summary>
[RegularExpression(@"(?i)^(http[s]?://|\\\\).+$", ErrorMessage = "Not good website")]
public string Website { get; set; }
Isn't your input somehow scrumbled. 不是你的输入不知何故。 I know PHP has a feature that adds magic quotes.... 我知道PHP有一个添加魔术引号的功能....
You are able to find a lot of regex expressions in library . 你可以在库中找到很多正则表达式。 Eg: for your task . 例如: 为了你的任务 。
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