Need help enhancing a Visual Studio Macro - regex

Question

Here's my current Macro
Public Module CopyrightCode
Sub AddCopyrightHeader()
Dim doc As Document
Dim docName As String
Dim companyName As String = "Urban Now"
Dim authorName As String = "Chase Florell"
Dim authorEmail As String = "chase#infinitas.ws"
Dim copyrightText As String = "' All code is Copyright © " & vbCrLf & _
"' - Urban Now (http://mysite.com)" & vbCrLf & _
"' - Infinitas Advantage (http://infinitas.ws)" & vbCrLf & _
"' All Rights Reserved"
' Get the name of this object from the file name
doc = DTE.ActiveDocument
' Get the name of the current document
docName = doc.Name
' Set selection to top of document
DTE.ActiveDocument.Selection.StartOfDocument()
DTE.ActiveDocument.Selection.NewLine()
Dim sb As New StringBuilder
sb.Append("' --------------------------------")
sb.Append(vbCrLf)
sb.Append("' <copyright file='" & docName & "' company='" & companyName & "'>")
sb.Append(vbCrLf)
sb.Append(copyrightText)
sb.Append(vbCrLf)
sb.Append("' </copyright>")
sb.Append(vbCrLf)
sb.Append("' <author>" & authorName & "</author>")
sb.Append(vbCrLf)
sb.Append("' <email>" & authorEmail & "</email>")
sb.Append(vbCrLf)
sb.Append("' <lastedit>" & FormatDateTime(Date.Now, vbLongDate) & "</lastedit>")
sb.Append(vbCrLf)
sb.Append("' ---------------------------------")
' Write first line
DTE.ActiveDocument.Selection.LineUp()
DTE.ActiveDocument.Selection.Text = sb.ToString
End Sub
End Module
What I need to do is first do a file search for the line ' <lastedit>Monday, July 05, 2010</lastedit> (obviously as a REGEX because the date will always be different)
and if it exists, replace the date with today's date, and if it doesn't run the full insert.
Then what I want to hook up is every time I close a file, the Macro runs to update the edit date.

Answer 1

I'm not sure what you're doing, but if that is XML (as it looks like), you should be using XQuery or whatever to locate/update the lastedit node, since that'll handle the assorted complexities of comments and nesting and so on.
If you're confident of what the input text will be and are certain there's no nasties in there, you can match that specific date format quick and dirty:
<lastedit>\w{6,9}, \w{3,9} \d\d, \d{4}</lastedit>
Or, even quicker and dirtier:
<lastedit>[^<]+<lastedit>
It depends what your needs are, how confident you are of what the file contents will be, and so on.
Oh. So I was curious and went and looked up how Visual Studio actually does it's regex stuff, and well... whoever did the VS regex needs to be whacked round the head.
Translate the above standard regex into VS regex, you get these:
\<lastedit\>:i+, :i+ :d:d, :d:d:d:d\</lastedit\>
and
\<lastedit\>[^<]+</lastedit\>
Maybe. It's hard to read the documentation because Microsoft don't appear to want to write websites that work in modern browsers.
Of course, that assumes macros use this insane regex instead of the normal .NET regex - if it's the latter than the top stuff will be fine and you can ignore this craziness. :)
To implement, try something like this:
Dim reLastEdit As Regex = New Regex("<lastedit>[^<]+<lastedit>")
Dim matches AS MatchCollection = reLastEdit.Matches(Input)
If matches.Count > 0
Then
' Change Header
Dim NewLastEdit As String = "<lastedit>" & FormatDateTime(Date.Now, vbLongDate) & "</lastedit>"
reLastEdit.Replace(Input,NewLastEdit)
Else
' Add Header
EndIf
Or similar. Info here: http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex_methods.aspx