Part 83 RegularExpression attribute in asp net mvc
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11 سال پیش
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Link for code samples used
Link for code samples used in the demo
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Regular expression attribute is great for pattern matching validation. Let's understand using Regular expression attribute with an
example. We will be continuing with the example that we started in Part 80 of the asp.net mvc tutorial.
Here is the requirement for validating Name property
1. Name can contain first and last name with a single space.
2. Last name is optional. If last name is not present, then there shouldn't be any space after the first name.
3. Only upper and lower case alphabets are allowed.
This requirement can be very easily met using RegularExpression attribute. In Employee.cs class file, decorate Name property with
RegularExpression attribute.
[RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$")]
public string Name { get; set; }
Notice that, we are passing regular expression string to the attribute constructor. Regular expressions are great for pattern
matching and ensures that, the value for name property is in the format that we want. Also, notice that we are using a verbatim
literal(@ symbol) string, as we don't want escape sequences to be processed. We discussed verbatim literal in Part 4 of C# tutorial.
Understanding and writing regular expressions is beyond the scope of this video. If you are interested in learning to write regular
expressions, here is a link from MSDN
http://msdn.microsoft.com/en-us/libra...
The following website is very helpful, for writing and testing regular expressions. This website also contains commonly used
regular expressions. Infact, I have picked up the regular expression for validating Name property from here.
http://gskinner.com/RegExr/
Let's discuss another example of using validation attribute. A valid internet email address should have an @ and a DOT symbol in it.
To match this pattern, use the following regular expression.
^[\w-\._\+%]+@(?:[\w-]+\.)+[\w]{2,6}$
In Employee.cs class file, decorate Email property with RegularExpression attribute as shown below.
[RegularExpression(@"^[\w-\._\+%]+@(?:[\w-]+\.)+[\w]{2,6}$", ErrorMessage = "Please enter a valid email address")]
public string Email { get; set; }
http://csharp-video-tutorials.blogspo...
Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help.
@aarvikitchen5572
Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists
https://www.youtube.com/user/kudvenka...
Regular expression attribute is great for pattern matching validation. Let's understand using Regular expression attribute with an
example. We will be continuing with the example that we started in Part 80 of the asp.net mvc tutorial.
Here is the requirement for validating Name property
1. Name can contain first and last name with a single space.
2. Last name is optional. If last name is not present, then there shouldn't be any space after the first name.
3. Only upper and lower case alphabets are allowed.
This requirement can be very easily met using RegularExpression attribute. In Employee.cs class file, decorate Name property with
RegularExpression attribute.
[RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$")]
public string Name { get; set; }
Notice that, we are passing regular expression string to the attribute constructor. Regular expressions are great for pattern
matching and ensures that, the value for name property is in the format that we want. Also, notice that we are using a verbatim
literal(@ symbol) string, as we don't want escape sequences to be processed. We discussed verbatim literal in Part 4 of C# tutorial.
Understanding and writing regular expressions is beyond the scope of this video. If you are interested in learning to write regular
expressions, here is a link from MSDN
http://msdn.microsoft.com/en-us/libra...
The following website is very helpful, for writing and testing regular expressions. This website also contains commonly used
regular expressions. Infact, I have picked up the regular expression for validating Name property from here.
http://gskinner.com/RegExr/
Let's discuss another example of using validation attribute. A valid internet email address should have an @ and a DOT symbol in it.
To match this pattern, use the following regular expression.
^[\w-\._\+%]+@(?:[\w-]+\.)+[\w]{2,6}$
In Employee.cs class file, decorate Email property with RegularExpression attribute as shown below.
[RegularExpression(@"^[\w-\._\+%]+@(?:[\w-]+\.)+[\w]{2,6}$", ErrorMessage = "Please enter a valid email address")]
public string Email { get; set; }
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