I have US phone number patternlike 111-111-1111 in text box. How can i validate it? And also some times i have phone number like 11-111-111-1111 . How can igive validation for this in C#(Windows application)?

Thanks in advance

You can find a very good library of Regex here





Please mark as Answer/ Helpful, if it helps you.

Hi Ganapatisb,

These are the regular expressions:
111-111-1111: ^\d{3}-\d{3}-\d{4}$
11-111-111-1111 : ^\d{2}-\d{3}-\d{3}-\d{4}$

The code snippet below shows how to use them:
private bool IsValid(string input)

{

System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(

@"^\d{3}-\d{3}-\d{4}$", System.Text.RegularExpressions.RegexOptions.Compiled);

if (reg.Match(input).Success)

return true;

else

return false;

}

You can get more about regular expressions from:
http://msdn.microsoft.com/en-us/library/2k3te2cs(VS.80).aspx
http://www.codeproject.com/KB/string/re.aspx

Let me know if this helps or not.
Aland Li

---

Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.

You can find a very good library of Regex here





Please mark as Answer/ Helpful, if it helps you.

Hi Ganapatisb,

These are the regular expressions:
111-111-1111: ^\d{3}-\d{3}-\d{4}$
11-111-111-1111 : ^\d{2}-\d{3}-\d{3}-\d{4}$

The code snippet below shows how to use them:
private bool IsValid(string input)

{

System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(

@"^\d{3}-\d{3}-\d{4}$", System.Text.RegularExpressions.RegexOptions.Compiled);

if (reg.Match(input).Success)

return true;

else

return false;

}

You can get more about regular expressions from:
http://msdn.microsoft.com/en-us/library/2k3te2cs(VS.80).aspx
http://www.codeproject.com/KB/string/re.aspx

Let me know if this helps or not.
Aland Li

---

Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.

Hi Aland,

Its working fine. Thanks a lot.