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As noted earlier, these are far from exhaustive, but we do check the common valid email forms user@foocom, THE_USER@foobarorg (uppercase, underscores, and compound domains), and firstlast@foojp (the standard corporate username firstlast, with a two-letter top-level domain jp), along with several invalid forms The application code for email format validation uses a regular expression (or regex) to define the format, along with the :format argument to the validates method (Listing 617)

10

class User < ActiveRecord::Base attr_accessible :name, :email email_regex = /\A[\w+\-]+@[a-z\d\-]+\[a-z]+\z/i :presence :length validates :email, :presence :format end validates :name, => => => => true, { :maximum => 50 } true, { :with => email_regex }

Systemoutprintln("Shiny new date: " + new Date()); } catch (IOException ioe) { ioeprintStackTrace(); } finally { try { sclose(); } catch (IOException e) {} } } }

email_regex = /\A[\w+\-]+@[a-z\d\-]+\[a-z]+\z/i validates :email, :presence => true, :format => { :with => email_regex }

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ensures that only email addresses that match the pattern will be considered valid So, where does the pattern come from Regular expressions consist of a terse (some would say unreadable) language for matching text patterns; learning to construct regexes is an art, and to get you started I ve broken email_regex into bite-sized pieces (Table 61)16 To really learn about regular expressions, though, I consider the amazing Rubular regular expression editor (Figure 66) to be simply essential17 The Rubular

The next step in XML design is to build a DTD based on the rough instance we worked out for the previous example A DTD, in its simplest form, contains a declaration of every element you want to use in your XML instances Examining the XML instance we defined in the previous section, the elements are

SetClock takes the host name (wally, in this case) or IP address of the time server from the command line It connects to the speci ed host and reads the 32bit time value using the readInt method on a javaioDataInputStream object There is one somewhat subtle point here Since the int primitive type is signed, the result returned from readInt must be promoted to a long and then truncated using the mask 0xFFFFFFFFL This choice of a mask results in both the promotion of the value returned from readInt as well as removing the effect of the unwanted sign extension The result is the true, unsigned 32-bit value returned by the time server represented within a long Since longs are 64 bits in width, this leaves plenty of room to perform the nal multiplication without the possibility of over ow Note that we could solve the problem more directly using the readLong method of DataInputStream The time server returns only 4 bytes before closing the connection The readLong method would attempt to read 8 bytes, and this would result in a javaioIOException being thrown by the underlying socket It is easier to see the effect of this example by rst setting a bogus date and time using the slush date command before running SetClock

16 Note that, in Table 61, letter really means lower-case letter , but the i at the end of the regex enforces case-insensitive matching 17 If you find it as useful as I do, I encourage you to donate to Rubular to reward developer Michael Lovitt for his wonderful work

TINI /> date 010120250000 GMT TINI /> date Wed Jan 1 00:00:22 GMT 2025 TINI /> java SetClocktini wally Crusty date: Wed Jan 01 00:01:06 GMT 2025 Shiny new date: Wed Jan 31 16:33:09 CST 2001

Meaning full regex start of regex match start of a string at least one word character, plus, hyphen, or dot literal at sign at least one letter, digit, hyphen, or dot literal dot at least one letter match end of a string end of regex case insensitive

SetClock uses the Date class to display the date and time before and after setting the RTC using setTickCount Just for good measure, it also sets the local time zone before displaying the new date and time Finally, note that setting the clock is not something that an application must perform every time it is run The clock is powered by a small lithium cell so that accurate time is maintained even in the absence of main power (V cc) However, some applications may want to use a network time server to synchronize the clock with the network time during the initialization phase and perhaps periodically thereafter

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