Making Example 4 more precise.

Author: sethvs

reference/3.0/Microsoft.PowerShell.Management/Rename-Item.md

@@ -71,7 +71,7 @@ This command uses the Rename-Item cmdlet to rename a registry key from Advertisi
 When the command is complete, the key is renamed, but the registry entries in the key are unchanged.
 ### Example 4
 ```
-PS C:\> get-childItem *.txt | rename-item -newname { $_.name -replace '\.txt','.log' }
+PS C:\> get-childItem *.txt | rename-item -newname { $_.name -replace '\.txt$','.log' }
 ```
 
 This example shows how to use the Replace operator to rename multiple files, even though the NewName parameter does not accept wildcard characters.
@@ -91,6 +91,8 @@ Because the Replace operator works with regular expressions, the dot preceding "
 To ensure that it matches only a dot (.), it is escaped with a backslash character (\\).
 The backslash character is not required in ".log" because it is a string, not a regular expression.
 
+To make sure that .txt is an extension, i.e. last part of the string representing the name, a dollar sign ($) is added after \\.txt.
+
 ### Example 5
 ```
 Get-ChildItem -Filter "*.MARKUP" -Recurse | Rename-Item -NewName {"2017-01-10-" + $_.name}