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and :\s*([-\w]+), only one of which can match The rst of these matches an equals sign followed by one or more word or hyphen characters (optionally enclosed in matching quotes using a conditional match), and the second matches a colon and then optional whitespace followed by one or more word or hyphen characters (Recall that a hyphen inside a character class is taken to be a literal hyphen if it is the rst character; otherwise, it means a range of characters, for example, [0-9]) We have used the reIGNORECASE ag to avoid having to write ( :( :[Ee][Nn]) [Cc][Oo][Dd][Ii][Nn][Gg]|[Cc][Hh][Aa][Rr][Ss][Ee][Tt]) and we have used the reVERBOSE ag so that we can lay out the regex neatly and include comments (in this case just numbers to make the parts easy to refer to in this text) There are three capturing match groups, all in the third part: (["']) which captures the optional opening quote, ([-\w]+) which captures an encoding that follows an equals sign, and the second ([-\w]+) (on the following line) that captures an encoding that follows a colon We are only interested in the encoding, so we want to retrieve either the second or third capture group, only one of which can match since they are alternatives The lastindex attribute holds the index of the last matching capture group (either 2 or 3 when a match occurs in this example), so we retrieve whichever matched, or use a default encoding if no match was made We have now seen all of the most frequently used re module functionality in action, so we will conclude this section by mentioning one last function The resplit() function (or the regex object s split() method) can split strings based on a regex One common requirement is to split a text on whitespace to get a list of words This can be done using resplit(r"\s+", text) which returns a list of words (or more precisely a list of strings, each of which matches \S+) Regular expressions are very powerful and useful, and once they are learned, it is easy to see all text problems as requiring a regex solution But sometimes using string methods is both suf cient and more appropriate For example, we can just as easily split on whitespace by using textsplit() since the strsplit() method s default behavior (or with a rst argument of None) is to split on \s+.

Exception Shielding The latest release of the Enterprise Library extends the functionality of the Exception Handling Application Block to provide a feature called exception , that can be used shielding It features a new attribute, to invoke an exception policy when a service is accessed Used in conjunc, you can fairly easily contion with the vert NET exceptions thrown by your operations into strongly typed instances related to a target data contract In addition to the other handlers such as wrap, replace, and logging, the , based on con guration, can be used to perform a elded mapping between a thrown exception and the data conattribute tract speci ed with a Consider using exception shielding as a way to catch and convert either all or a speci c subset of exception types that are not already processed using one of the techniques described in this chapter Details and examples of using Enterprise Library for WCF exception shielding can be found on MSDN at http://msdn2microsoftcom/en-us/ library/aa480591aspx

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Summary

Regular expressions offer a powerful way of searching texts for strings that match a particular pattern, and for replacing such strings with other strings which themselves can depend on what was matched In this chapter we saw that most characters are matched literally and are implicitly quanti ed by {1} We also learned how to specify character classes sets of characters to match and how to negate such sets and include

The mapping between keys and the abstract action events does not change during the execution of an application One of the device-specific key codes mapped to a particular action can be retrieved with the method CanvasgetKeyCode However, since several keys may be mapped to a single action, comparing key events to these key codes is not recommended and CanvasgetGameAction should be used instead

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