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ASP.NET/VB/REGEX: Leading Stuff  Zapped

Posted on 2013-05-20
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Last Modified: 2013-06-03
This code does not work if there are special characters like colons or hyphens before the matching phone number.

Imports System.Web
Partial Class test
    Inherits System.Web.UI.Page
    Protected Function REGEX(text As String) As String
        Dim input As String = ""

input = 
"This works 423-555-1212" & vbCrlf &
"This works (423) 555-1212" & vbCrlf &
"This works 4235551212" & vbCrlf &
"" & vbCrlf &
"This looses the hyphen - 4235551212" & vbCrlf &
"This losses the space before the phone number: 423-555-1212" & vbCrlf &
"This losses the space before the phone number: (423) 555-1212" & vbCrlf &
"This losses the space before the phone number: 4235551212" & vbCrlf &
"(This losses the space before the phone number) 423-555-1212" & vbCrlf &
"This losses the space before the phone number; 423-555-1212"

' Phone Numbers
input = RegularExpressions.Regex.Replace(input, "(\s?)(?!<\d[^a-z\d\n]{0,2})1?[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)[^a-z\n\d,]*(\d)(?![a-z\d\n]{0,2}\d)", "$1$2$3$4.$5$6$7.$8$9$10$11")

Return input

    End Function
    Protected Sub _Index_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles me.load
        out.Text = REGEX(Request.Form("c"))
    End Sub
 
End Class

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Question by:hankknight
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5 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39181306
What is supposed to happen, or what should the data look like after the function is run?
0
 
LVL 16

Author Comment

by:hankknight
ID: 39181381
This:
This works 423-555-1212
This works (423) 555-1212
This works 4235551212
This looses the hyphen - 4235551212
This losses the space before the phone number: 423-555-1212
This losses the space before the phone number: (423) 555-1212
This losses the space before the phone number: 4235551212
(This losses the space before the phone number) 423-555-1212
This losses the space before the phone number; 423-555-1212

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Becomes this:
This works 423.555.1212
This works 423.555.1212
This works 423.555.1212
This looses the hyphen 423.555.1212
This losses the space before the phone number423.555.1212
This losses the space before the phone number423.555.1212
This losses the space before the phone number423.555.1212
(This losses the space before the phone number423.555.1212
This losses the space before the phone number423.555.1212

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But it should become this:
This works 423.555.1212
This works 423.555.1212
This works 423.555.1212
This looses the hyphen - 423.555.1212
This losses the space before the phone number: 423.555.1212
This losses the space before the phone number: 423.555.1212
This losses the space before the phone number: 423.555.1212
(This losses the space before the phone number) 423.555.1212
This losses the space before the phone number; 423.555.1212

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Notice how certain chararacters including spaces, hyphen, and colons are lost if there is a special character before the phone number.
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39181457
You pattern seems overly-complicated. Can we try with this instead:

...

' Phone Numbers
input = RegularExpressions.Regex.Replace(input, "\b(?:(?<=\d{3})-(?=\d{4})|(?<=\d{3})-(?=\d{3}))\b", ".")  ' Replace delimited phone numbers
input = RegularExpressions.Regex.Replace(input, "\b(\d{3})(\d{3})(\d{4})\b", "$1.$2.$3")  ' Replace non-delimited phone numbers

...

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0
 
LVL 16

Author Comment

by:hankknight
ID: 39181515
Your pattern does not work with this:
Phone Number: (423) 555-1212

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It should become:
Phone Number: 423.555.1212

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0
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 39181963
Add one more line after the other two:

input = RegularExpressions.Regex.Replace(input, "\((\d{3})\)\s*(?=\d{3})", "$1.")  ' Replace parenthesized area codes

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