This is quick-and-dirty script for text replacement. Edit to suit...
CODE
'set input and output files (can be the same)
Const InFile = "C:\test\test.txt"
Const OutFile = "C:\test\test.txt"
'set file open mode constants
Const ForReading = 1
Const ForWriting = 2
'create scripting object
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile(InFile, ForReading)
'read the file to string variable
strText = objFile.ReadAll
'close the file
objFile.Close
'do the rerplacements, add one line for each replacement
strText = Replace(strText, "http://", " ")
strText = Replace(strText, "ftp:", " ")
'write corrected string to file
Set objFile = objFSO.OpenTextFile(OutFile, ForWriting)
objFile.WriteLine strText
'close the file'
objFile.Close