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You can specify case-insensitive matches by using ( i) at the start of a regular expression: > samplestring =~ regex "( i)HIS";; val it : bool = true > samplestring =~ regex "HIS";; val it : bool = false Here is a final example, showing the use of named groups. let entry = @" Jolly Jethro 13 Kings Parade Cambridge, Cambs CB2 1TJ " let re = regex @"( <=\n)\s*( <city>[^\n]+)\s*,\s*( <county>\w+)\s+( <pcode>.{3}\s*.{3}).*$" You can now use this regular expression to match the text and examine the named elements of the match: > let r = re.Match(entry);; val r : Match > r.Groups.Item("city").Value;; val it : string = "Cambridge" > r.Groups.Item("county").Value;; val it : string = "Cambs" > r.Groups.Item("pcode").Value;; val it : string = "CB2 1TJ" Note that at the time of writing, F# requires that you use the Item property to examine elements of a match group. The F# designers have indicated that in a future release you will be able to use the shorter notation r.Groups.["city"].Value.

Think about what we ve just done for a moment. We ve added the primary Ethernet ID for this specific computer to the local_computer account. We won t be able to use this account on any other computer; instead we ll need a way to create an equivalent account on each of our managed computers, each with the Ethernet ID specific to that computer. We can solve this problem, but we ll save that for a bit later.

Note .NET regular expressions have many more features than those described here. For example, you can

easily compile regular expressions. You can also use regular expressions to define sophisticated text substitutions. With a little more work, you can also define active patterns based on functions defined using regular expressions. We discussed active patterns in 9. This and other more advanced topics are discussed at http://www.expert-fsharp.com/Topics/RegularExpressions.

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You can access Excel cells with the Range property. To access a single cell, use code similar to .Range(Cell1:="B5"). To access a group of cells, do one of the following: Use a cell reference for the Cell1 argument with code similar to .Range(Cell1:="B4:D11"). Use a starting cell reference for the Cell1 argument and an ending cell reference for the Cell2 argument with code similar to .Range(Cell1:="B4", Cell2:="D11"). Use a named cell group for the Cell1 argument with code similar to .Range(Cell1:="StoreData").

Throughout this book we have used F# printf format strings to format text and output, and we introduced the basic format specifiers for this kind of text formatting in 4. Functions such as printf and printfn are located in the Microsoft.FSharp.Text.Printf module. Another way to format strings is to use the System.String.Format static method or the other .NET composite formatting functions such as System.Console.WriteLine and TextWriter. WriteLine. This is a completely distinct set of formatting functions and directives redesigned and implemented from the ground up for the .NET platform. Like printf, these methods take a format specifier and the objects to be formatted. The format specifier is a string with any number of format items acting as placeholders and designating which object is to be formatted and how. Consider the following simple example: > string.Format("{0} {1} {2}", 12, "a", 1.23);; val it : string = "12 a 1.23" Each format item is enclosed in braces giving the index of the object to be formatted, and each can include an optional alignment specification (always preceded by a comma after the index, giving the width of the region in which the object is to be inserted, as in {0, 10}) and a format type that guides how the given object is formatted (as in {0:C}, where C formats as a system currency). The general syntax of the format item is as follows: {index[,alignment][:formatType]} You can use the alignment value to pad the formatted object with spaces, and text alignment is left if its value is negative and right if positive. Table 10-7 summarizes the most often used format types. Table 10-7. The .NET Format Specifiers

Now that we have a local_computer record, we can create one or more computer groups. Let s start simply. Switch to the view of computer groups by clicking the icon that looks like two screens in the top left pane of Workgroup Manager. Click the New Computer Group icon in the toolbar, and name the new group loginwindow. It should look like the example in Figure 7-5.

Currency Decimal/long date Scientific Fixed-point General Number Percent Hexadecimal Short/long date Short/long time Month Year

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