Phone Number Validation

Question

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Hey guys I have a quick question maybe you could help. I'm trying to validate a phone number using RegEx but because the phonenumber has a + I can't seem to get it to work. I know best way is to use jquery or that but it is an old application.

VB

Case eValidateInput.IsPhoneNumberWithPlus

                       Dim objRegExWithPlus As New System.Text.RegularExpressions.Regex("[+][0-9]{" & InputValue.Length - 1 & "}")
                       Dim objRegExWithNoPlus As New System.Text.RegularExpressions.Regex("[0-9]{" & InputValue.Length & "}")

                       If Not objRegExWithPlus.IsMatch(InputValue) And Not objRegExWithNoPlus.IsMatch(InputValue) Then
                           sValidationMsg = "'" & InputName & "' must be a numeric value"
                       End If

Cheers guys

Posted 21-Aug-12 2:05am

frostcox

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Comments

ridoy 21-Aug-12 9:09am

give a format of phone number for what you are trying..

frostcox 21-Aug-12 9:28am

+222 345 2345 will be the format. Thanks

ridoy 21-Aug-12 13:08pm

I again ask you..is + is common for all number? and look,after first 3 digit(222) there is a space,then another 3 digit.I ask you this space is required or optional?

2 solutions

Solution 1

This is what i m using:
it accepts below prefix

C#

+91-9898989898 or +919898989898 or 09898989898 

/^(\+91-|\+91|0)?\d{10}$/

Specific on +91 then use,

C#

/^(\+91)?\d{10}$/

Posted 21-Aug-12 2:20am

Karthik J, Coimbatore

Updated 21-Aug-12 2:28am

v2

Comments

frostcox 21-Aug-12 8:35am

The format of my phone number will be +233 678 7890, so will this take care of this? cheers.

frostcox 21-Aug-12 8:51am

But the number won't always have a + sign

Kenneth Haugland 21-Aug-12 17:12pm

/^(\+91-|\+91|0|91)?\d{10}$/ ?

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Matt T Heffron · Accepted Answer · 2012-08-21T10:53:00

You only need a single RegEx.
Use the conditional quantifiers in the Regex:

VB

Case eValidateInput.IsPhoneNumberWithPlus
  Dim objRegEx As New System.Text.RegularExpressions.Regex("^\+?\s?\d{3}\s?\d{3}\s?\d{4}$")
 
  If Not objRegEx.IsMatch(InputValue) Then
    sValidationMsg = "'" & InputName & "' must be a numeric value"
  End If

Explanation of the Regex: ^\+?\s?\d{3}\s?\d{3}\s?\d{4}$

^       match must start at the beginning of the string
\+?     0 or 1 + character
\s?     0 or 1 whitespace character
\d{3}   exactly 3 decimal digits
\s?     0 or 1 whitespace character
\d{3}   exactly 3 decimal digits
\s?     0 or 1 whitespace character
\d{4}   exactly 4 decimal digits
$       match must end at the end of the string

This should match:
+222 345 6789
+222345 6789
+222 3456789
+2223456789
222 345 6789
222345 6789
222 3456789
2223456789