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The rst example demonstrated the effect of allowing an unhandled exception to rise through the service implementation layers to the service host Notice that in Figure 101, the type of exception returned to the caller is This is a base -derived type used in WCF to integrate with the SOAP fault speci cation By default, exceptions that reach the service host that are not derived are considered indications of a potentially fatal confrom and the original dition The exception is replaced by a exception s details are omitted unless the option is enabled The is then serialized as a SOAP fault for communication back to the caller (save for one-way invocations) Again, if the call was part of a session, that session will be destroyed and will need to be re-created The fatal condition created by unhandled exceptions can be prevented by catching exceptions before they reach the service host and throwing a manually The class has a number of

In practical applications we often need regexes that can match any one of two or more alternatives, and we often need to capture the match or some part of the match for further processing Also, we sometimes want a quanti er to apply to several expressions All of these can be achieved by grouping with (), and in the case of alternatives using alternation with | Alternation is especially useful when we want to match any one of several quite different alternatives For example, the regex aircraft|airplane|jet will match any text that contains aircraft or airplane or jet The same thing can be achieved using the regex air(craft|plane)|jet Here, the parentheses are used to group expressions, so we have two outer expressions, air(craft|plane) and jet The rst of these has an inner expression, craft|plane, and because this is preceded by air the rst outer expression can match only aircraft or airplane Parentheses serve two different purposes to group expressions and to capture the text that matches an expression We will use the term group to refer to a grouped expression whether it captures or not, and capture and capture group to refer to a captured group If we used the regex (aircraft|airplane|jet) it would not only match any of the three expressions, but would also capture whichever one was matched for later reference Compare this with the regex (air(craft|plane)|jet) which has two captures if the rst expression matches ( aircraft or airplane as the rst capture and craft or plane as the second capture), and one capture if the second expression matches ( jet ) We can switch off the capturing effect by following an opening parenthesis with :, so for example, (air( :craft|plane)|jet) will have only one capture if it matches ( aircraft or airplane or jet ) A grouped expression is an expression and so can be quanti ed Like any other expression the quantity is assumed to be one unless explicitly given For.

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example, if we have read a text le with lines of the form key=value, where each key is alphanumeric, the regex (\w+)=(+) will match every line that has a nonempty key and a nonempty value (Recall that matches anything except newlines) And for every line that matches, two captures are made, the rst being the key and the second being the value For example, the key=value regular expression will match the entire line topic= physical geography with the two captures shown shaded Notice that the second capture includes some whitespace, and that whitespace before the = is not accepted We could re ne the regex to be more exible in accepting whitespace, and to strip off unwanted whitespace using a somewhat longer version:

[ \t]*(\w+)[ \t]*=[ \t]*(+)

constructors and properties that allow you to specify different required and optional values that relate to the SOAP fault representation A recommended pattern is for the service code to catch any exceptions and extract the relevant details for inclusion in a new instance An example of this is demonstrated in Listing 106

adding constraint modifiers PASSWORD, SENSITIVE, and NON_PREDICTIVE that restrict how the values are displayed or cached (see the setConstraints method), and

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