String Functions in PowerShell

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PowerShell uses .NET objects everywhere. Anything is represented as .NET object, and .NET objects come with useful built-in methods. However, for string manipulation you do not need to look for sophisticated external commands as they are built right into strings.
Here are a couple of useful examples:

1. "Hello".ToLower()
   
2. "Hello".ToUpper()
   
3. "Hello".EndsWith('lo')
   
4. "Hello".StartsWith('he')
   
5. "Hello".toLower().StartsWith('he')
   
6. "Hello".Contains('l')
   
7. "Hello".LastIndexOf('l')
   
8. "Hello".IndexOf('l')
   
9. "Hello".Substring(3)
   
10. "Hello".Substring(3,1)
    
11. "Hello".Insert(3, "INSERTED")
    
12. "Hello".Length
    
13. "Hello".Replace('l', 'x')
    
14. "Server1,Server2,Server3".Split(',')
    
15. " remove space at ends ".Trim()
    
16. " remove space at ends ".Trim(' rem')

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http://powershell.com/cs/blogs/tips/archive/2009/06/08/using-string-functions.aspx