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Microsoft .NET packs all its regular expressions functionality into six classes and one delegate, which are described in Table 7-3. All these classes are part of the System.Text.RegularExpressions namespace.

the action objects using a data member reference. It is not as object-oriented as other programming techniques, but when dealing with multiple data stream types, it is the simplest and least problematic to create a consistent and maintainable data stream.

Class that performs regular expression operations. It can be instantiated to represent a compiled instance of a regular expression, or its static methods can be used to perform the same actions. Represents the result of a single match. Represents a collection of Capture objects. Represents the results of a capturing group (an expression written between parentheses in the regular expression), in the form of a CaptureCollection object. Represents a collection of Group objects. Represents the result of a single regular expression match. The captures are available via the Captures member, which returns a CaptureCollection object, and the captured groups are available via the Groups member, which is a GroupCollection object. Represents a collection of Match objects. A delegate that can be used during regular expression based text replacement operations. A delegate represents a reference to a method, and you can use delegates to pass method references as parameters. This particular delegate helps in replacement operations, when the replacement string for each match must be calculated using C# code depending on the match. In those cases, instead of providing a simple replacement string, you pass an instance of MatchEvaluator.

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Given the sample data in Figure A-1, use Goal Seek to calculate the number of ounces in three liters.

When writing custom types, two methods should always be implemented: Equals() and GetHashCode(). These two methods are used by the .NET library API when comparing and manipulating instances in a list or a collection. It just happened in this chapter s example that a list of string types did the right thing. If TextProcessor had used the Ticket type, then the Equals() method of the list used to find date duplicates would not have worked. The default implementations of Equals() and GetHashCode() are not implemented properly. This is no fault of the .NET API. Rather, it is a recognition that Microsoft cannot know the structure of an object and what is considered as making a type unique.

When instantiating the Regex class, you get an object that represents a regular expression. That object can then be used to perform matches or string replacement operations. Here s a simple example of using Regex, Match, and Group: Regex regex = new Regex("^/(.*)-d([0-9]+)/.*-c([0-9]+)/ $"); Match match = regex.Match("/Anniversary-Balloons-d1/Love-Romance-c1/"); Group group = match.Groups[1]; string deptUrlName = group.Value; After this code executes, deptUrlName will contain Anniversary-Balloons. The Groups collection contains the matching strings. In our case this collection has three members, whose values are Anniversary-Balloons, 1, and 1.

Implementing GetHashCode()

The captured groups the expressions written between parentheses are accessible via the Groups collection. The first element of the collection contains the entire matching string (/Anniversary-Balloons-d1/Love-Romance-c1/). For retrieving the department name, which is captured by the (.*) expression, we ve read the second group from the Match object match.Groups[1]. To read the ID of the department and the ID of the category, we d need to read match.Groups[2] and match.Groups[3], respectively. When creating a Regex object, the object stores the regular expression internally in a specific, compiled format, which helps improve the performance for any subsequent operations the object will perform. When a certain match or replace operation is performed only once, you can use the static methods of Regex, which create a Regex object for you, use it to perform the required operation, and destroy it afterward. Here s an example: Match match = Regex.Match("/Anniversary-Balloons-d1/Love-Romance-c1/", "^/(.*)-d([0-9]+)/.*-c([0-9]+)/ $"); Group group = match.Groups[1]; string deptUrlName = group.Value; In practice, when needing to extract data from matching groups, instead of accessing the groups by index, we prefer using named groups. In the following example you can see how we ve given a name to the group that captures the product s name, and then we accessed the group by its name: Match match = Regex.Match("/Anniversary-Balloons-d1/Love-Romance-c1/", "^/( <DEPTNAME>.*)-d([0-9]+)/.*-c([0-9]+)/ $"); Group group = match.Groups["DEPTNAME"]; string deptUrlName = group.Value; Table 7-4 describes the most frequently used methods of Regex.

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