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Using the base class is a simple way to prevent unhandled exceptions from reaching the service host and potentially canceling your s sufsessions and invalidating the client proxy However, s, fer from a lack of identity If your service returns only you are making it dif cult for client application developers to create robust exception-handling logic Consider the example in Listing 108

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Interface ItemCommandListener can be used for defining context-sensitive command actions for Items (see the setItemCommandListener method)

est way is to use the regex \b(Helen\s+Patricia)\s+Sharman\b But we could also achieve the same thing using a lookahead assertion, for example, \b(Helen\s+Patricia)( =\s+Sharman\b) This will match Helen Patricia only if it is preceded by a word boundary and followed by whitespace and Sharman ending at a word boundary To capture the particular variation of the forenames that is used ( Helen , Helen P , or Helen Patricia ), we could make the regex slightly more sophisticated, for example, \b(Helen( :\s+( :P\|Patricia)) )\s+( =Sharman\b) This matches a word boundary followed by one of the forename forms but only if this is followed by some whitespace and then Sharman and a word boundary Note that only two syntaxes perform capturing, (e) and ( P<name>e) None of the other parenthesized forms captures This makes perfect sense for the lookahead and lookbehind assertions since they only make a statement about what follows or precedes them they are not part of the match, but rather affect whether a match is made It also makes sense for the last two parenthesized forms that we will now consider We saw earlier how we can backreference a capture inside a regex either by number (eg, \1) or by name (eg, ( P=name)) It is also possible to match conditionally depending on whether an earlier match occurred The syntaxes are ( (id)yes_exp) and ( (id)yes_exp|no_exp) The id is the name or number of an earlier capture that we are referring to If the capture succeeded the yes_exp will be matched here If the capture failed the no_exp will be matched if it is given Let s consider an example Suppose we want to extract the lenames referred to by the src attribute in HTML img tags We will begin just by trying to match the src attribute, but unlike our earlier attempt we will account for the three forms that the attribute s value can take: single quoted, double quoted, and unquoted Here is an initial attempt: src=(["'])([^"'>]+)\1 The ([^"'>]+) part captures a greedy match of at least one character that isn t a quote or > This regex works ne for quoted lenames, and thanks to the \1 matches only when the opening and closing quotes are the same But it does not allow for unquoted lenames To x this we must make the opening quote optional and therefore match only if it is present Here is a revised regex: src=(["']) ([^"'>]+)( (1)\1) We did not provide a no_exp since there is nothing to match if no quote is given Unfortunately, this doesn t work quite right It will work ne for quoted lenames, but for unquoted lenames it will work only if the src attribute is the last attribute in the tag; otherwise it will incorrectly match text into the next attribute The solution is to treat the two cases (quoted and unquoted) separately, and to use alternation: src=((["'])([^\1>]+ )\1|([^"' >]+)) Now let s see the regex in context, complete with named groups, nonmatching parentheses, and comments:.

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<img\s+ [^>]* src= ( : ( P<quote>["']) ( P<qimage>[^\1>]+ ) ( P=quote) | ( P<uimage>[^"' >]+) ) [^>]* > # start of the tag # any attributes that precede the src # start of the src attribute # # # # #

The challenge here is that there is no subclass of that regions speci c to a set of scecan be used to create error handling narios The next best approach that the client application developer can take is writing code to investigate each exception at runtime to parse information from the properties to hopefully determine the correct course of recovery or processing

opening quote image filename closing quote matching the opening quote ---or alternatively--unquoted image filename

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