PS C:\> "XYZ\p107225" -cmatch "^[a-zA-Z]{2,3}\\p10[0-9]{4}$")
http://blogs.technet.com/b/technetczsk/archive/2010/02/15/serial-windows-powershell-ps-pro-programatory-cast-6.aspx
http://www.regular-expressions.info/
PS C:\> "XYZ\p107225" -cmatch "^[a-zA-Z]{2,3}\\p10[0-9]{4}$")
http://blogs.technet.com/b/technetczsk/archive/2010/02/15/serial-windows-powershell-ps-pro-programatory-cast-6.aspx
http://www.regular-expressions.info/