c# - regular expression for indian phone number

Question

am looking for the regular expression of indian phone number

the regular expression should allow all the following formats.

for landline no

0802404408
080-2404408
+91802404408
+91-802404408

for mobile no

8147708287
08147708287
+918147708287
+91-8147708287

can anyone help me, thanks in advance

my code is

[RegexValidator("[0-9 -]*"
, MessageTemplateResourceName = "INVALID_PHONE"
, MessageTemplateResourceType = typeof(ValidatioinErrors))]
public string Phone
{
        get { return phone; }
        set { phone = value; }
}

public bool IsValid()
    {
        return Validation.Validate<Class_name>(this).IsValid;
    }

    public ValidationResults ValResults
    {
        get
        {
            return Validation.Validate<Class_name>(this);
        }
    }

for this validation thing I just referred

using Microsoft.Practices.EnterpriseLibrary.Validation;
using Microsoft.Practices.EnterpriseLibrary.Validation.Validators;

in my namespace, in the UI part the expression is working fine, but in the code behind as above, it shows "Invalid Phone number", if I give value as 080-2404408

Answer 1

You can try

^+?[0-9-]+$

See it here on Regexr

The important parts are the anchors ^ and $ for the start and the end of the string. I added also +? at the start, to match an optional +. The + needs to be escaped since it is a special character in regex, the ? after it makes it optional.

Of course this is a very simple pattern, be aware that e.g. "-----" would also be valid.