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Tip of the Day
Language: VBScript
Expertise: Intermediate
Jul 27, 2004

Extracting Parameters from a File Using Regular Expressions

Extracting parameters from a file using regular expressions can be a very effective and practical way of doing things. Suppose, for instance, that you need a logon script that maps drives depending on the computer's sites. A custom parameter file could look like this:

Site1.MapDrive_X=\\server1\share1
Site1.MapDrive_Y=\\server1\share2
Site2.MapDrive_X=\\server3\share1
Site3.MapDrive_Z=\\server4\share4
Extracting those parameters would be as easy as getting the actual site name, building a regular expression, and looping on found matches. Assuming that you've got a ParameterFileContent variable already available, you'd have something like this:

set oRegExp = new RegExp
oRegExp.Global = True 'To get all matches
oRegExp.IgnoreCase = True 'We don't want to bother with case in our parameter file

'Mapping drives for the current ActiveDirectory site
Set oAdSysInfo = CreateObject("ADSystemInfo")
oRegExp.Pattern = oAdSysInfo.SiteName & "\.MapDrive_(\w)=(.*)" 
Set oMatchCol = oRegExp.Execute(ParameterFileContent)
For Each oMatch In oMatchCol '
  DriveName = oMatch.SubMatches(0) 'The \w from the first set of parenthesis
  SharePath = oMatch.SubMatches(1) 'The .* from the second set of parenthesis
  WScript.Echo("DriveName=" & DriveName & " SharePath=" & SharePath)
  WshNetwork.MapNetworkDrive DriveName & ":",SharePath,False
Next

Reuse the oRegExp object to process any other needed parameter...

GroupName2.RunApplication=\\server1\share1\Application1\Application1.exe
GroupName2.MapNetworkDrive_X=\\server1\share1  
Site1.SQLServerName=SQL01
Stephane Courcy Poitras
 
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