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As we noted earlier, we use raw strings to avoid having to escape backslashes Another way of writing this regex would be to use the character class [\dA-F] and pass the reIGNORECASE ag as the last argument to the recompile() call, or to use the regex ( i)#[\dA-F]{6}\b which starts with the ignore case ag If more than one ag is required they can be combined using the OR operator (|), for example, reMULTILINE|reDOTALL, or ( ms) if embedded in the regex itself We will round off this section by reviewing some examples, starting with some of the regexes shown in earlier sections, so as to illustrate the most commonly used functionality that the re module provides Let s start with a regex to spot duplicate words:

Because IIS is hosting the service, the service endpoint de nitions must be speci ed in con guration rather than code The con guration information is , under the node As with stored in

double_word_re = recompile(r"\b( P<word>\w+)\s+( P=word)( !\w)", reIGNORECASE) for match in double_word_refinditer(text): print("{0} is duplicated"format(matchgroup("word")))

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The regex is slightly more sophisticated than the version we made earlier It starts at a word boundary (to ensure that each match starts at the beginning of a word), then greedily matches one or more word characters, then one or more whitespace characters, then the same word again but only if the second occurrence of the word is not followed by a word character If the input text was win in vain , without the rst assertion there would be one match and one capture: win in vain There aren t two matches because while ( P<word>) matches and captures, the \s+ and ( P=word) parts only match The use of the word boundary assertion ensures that the rst word matched is a whole word, so we end up with no match or capture since there is no du-

The MIDP low-level user interface API is designed for applications that need precise placement and control of graphic elements as well as access to low-level input events Typical examples of application components that might utilize the low-level user interface API are a game board, a chart object, or a graph

plicate whole word Similarly, if the input text was one and and two let s say , without the last assertion there would be two matches and two captures: one and and two let's say The use of the lookahead assertion means that the second word matched is a whole word, so we end up with one match and one capture: one and and two let's say The for loop iterates over every match object returned by the finditer() method and we use the match object s group() method to retrieve the captured group s text We could just as easily (but less maintainably) have used group(1) in which case we need not have named the capture group at all and just used the regex \b(\w+)\s+\1( !\w) Another point to note is that we could have used a word boundary \b at the end, instead of ( !\w) Another example we presented earlier was a regex for nding the lenames in HTML image tags Here is how we would compile the regex, adding ags so that it is not case-sensitive, and allowing us to include comments:

other hosting models, the endpoint must de ne the ABCs: address, binding, le that hosts a service within and contract Listing 112 shows a node is identical to Listing 15 IIS Note that the The address of the service is de ned by the address of the virtual directory in which the SVC le resides If there s just one endpoint de ned in the service, then the endpoint address can be blank, which implies that the endpoint address is the same as the service address If there are multiple endpoints de ned in a service, then each endpoint can have a relative address The binding must use a channel stack that uses HTTP as the transand port Two transports that are built in to WCF are Custom bindings, those that compose a channel stack differently than the built-in implementations are also supported, so long as they use http as their transport Custom bindings are covered in detail in s 3 and 4 The endpoint contract de nes the class implemented by the service The runtime code must be accessible to the service, either in the /bin directory, in the GAC, or inline in the SVC le

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