1. Problem
You want to determine if a string contains another string, or want to find the position of a string within another string.
2. Solution
PowerShell provides several options to help you search a string for text.
Use the –like operator to determine whether a string matches a given DOS-like wildcard:
        PS >”Hello World” -like “*llo W*”
        True
[...]

The Where-Object cmdlet is incredibly powerful, in that it allows you to filter your output based on arbitrary criteria. For extremely simple filters (such as filtering based only on a comparison to a single property), though, the syntax can get a little ungainly:
        Get-Process | Where-Object { $_.Handles -gt 1000 }

For this type of situation, [...]

Using the Regfind utility, you can easily search the Registry for a value, regardless of the key, and replace it.
Regfind (from the Windows 2000 Server Resource Kit) can be an invaluable tool when you need change a Registry key that you know the value for but when do not necessarily know the full path. Recently [...]