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website has a beautiful interactive interface for making regular expressions, along with a handy regex quick reference I encourage you to study Table 61 with a browser window open to Rubular no amount of reading about regular expressions can replace a couple of hours playing with Rubular By the way, there actually exists a full regex for matching email addresses according to the official standard, but it s really not worth the trouble The one in Listing 617 is fine, maybe even better than the official one18 The tests should all be passing now (In fact, the tests for valid email addresses should have been passing all along; since regexes are notoriously error-prone, the valid email tests are there mainly as a sanity check on email_regex) This means that there s only one constraint left: enforcing the email addresses to be unique

Each of these elements must be defined within the DTD using an "ELEMENT" keyword, such as:

To enforce uniqueness of email addresses (so that we can use them as usernames), we ll be using the :unique option to the validates method But be warned: there s a major caveat, so don t just skim this section read it carefully We ll start, as usual, with our tests In our previous model tests, we ve mainly used Usernew, which just creates a Ruby object in memory, but for uniqueness tests we actually need to put a record into the database19 The (first) duplicate email test appears in Listing 618

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The watchdog timer provides a hardware reset of TINI s microcontroller to recover from fatal problems in software that prevent normal operation of the embedded system as a whole This section presents the need for a watchdog and describes its use from a Java application

describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom" } end

Many embedded systems are deployed in remote locations and must run continuously without manual intervention To achieve very reliable operation over long periods of time, an embedded system needs a mechanism for detecting and correcting fatal execution errors in the software that controls the system Unresponsive software can be caused by several distinct problems such as the following Thread termination due to an unhandled exception Deadlocked threads A crash of the underlying OS Momentary hardware failures due to environmental stresses such as ESD (Electrostatic Discharge)

18 Did you know that "Michael Hartl"@examplecom, with quotation marks and a space in the middle, is a valid email address according to the standard Incredibly, it is but it s absurd If you don t have an email address that contains only letters, numbers, underscores, and dots, then get one NB The regex in Listing 617 allows plus signs, too, because Gmail (and possibly other email services) does something useful with them: for example, to filter orders from Amazon, you can use username+amazon@gmailcom, which will go to the Gmail address username@gmailcom, allowing you to filter on the string amazon 19 As noted briefly in the introduction to this section, there is a dedicated test database, db/testsqlite3, for this purpose

<!ELEMENT E-MAIL (FROM, TO, SUBJECT, BODY)> <!ELEMENT FROM (#CDATA)*> <!ELEMENT TO (#CDATA)*> <!ELEMENT SUBJECT (#CDATA)*> <!ELEMENT BODY (#CDATA)*>

The conventions in this book are mostly self-explanatory; in this section, I ll mention some that may not be First, both the HTML and PDF editions of this book are full of

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