How to apply validation textbox should accept starting number 1300 or 1800 only in ASP.NET mvc5

Question

1.00/5 (1 vote)

See more:

Hi all,
i want to apply validation for textbox, it should accept starting number 1300 or 1800 only.. this is my requirement
please provide soultion regarding this

What I have tried:

[Required(ErrorMessage = "Please enter the Telephone")]
       [RegularExpression("(^1300\d{6}$)|(^1800\d{6}$)", ErrorMessage = "Entered number must be start with 1300 or 1800")]
       [Display(Name = "Telephone *")]
       public string Telephone { get; set; }

Posted 17-Aug-17 20:09pm

VenkataSeshu B

Updated 18-Aug-17 3:36am

Add a Solution

Comments

Patrice T 18-Aug-17 4:35am

What is the problem with this RegEx ?

VenkataSeshu B 18-Aug-17 5:39am

it is not taking \ symbol before d{6}

Patrice T 18-Aug-17 5:42am

Show a sample of what you want to match.

Use Improve question to update your question.
So that everyone can pay attention to this information.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2017-08-18T03:36:00

C# has two types of string literals - regular and verbatim.
String Literals | C# Language Specification | Microsoft Docs[^]

You are using a regular string literal, which means you need to escape certain characters by prefixing them with \. For a literal \, you need to double it up:

C#

[RegularExpression("(^1300\\d{6}$)|(^1800\\d{6}$)", ErrorMessage = "Entered number must be start with 1300 or 1800")]

Alternatively, you could use a verbatim string literal by prefixing the string with @:

C#

[RegularExpression(@"(^1300\d{6}$)|(^1800\d{6}$)", ErrorMessage = "Entered number must be start with 1300 or 1800")]