Pro PHP and jQuery by Jason Lengstorf.pdf - Computer Science ...

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314 CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS The only difference between str_replace() and preg_replace() on a basic level is that the element passed to preg_replace() for the pattern must use delimiters, which let the function know which part of the regex is the pattern and which part consists of modifiers, or flags that affect how the pattern matches. You’ll learn more about modifiers a little later in this section. The delimiters for regex patterns in preg_replace() can be any non-alphanumeric, non-backslash, and non-whitespace characters placed at the beginning and end of the pattern. Most commonly, forward slashes (/) or hash signs (#) are used. For instance, if you want to search for the letters cat in a string, the pattern would be /cat/ (or #cat#, %cat%, @cat@, and so on). Choosing Regexes vs. Regular String Replacement To explore the differences between str_replace() and preg_replace(), try using both functions to wrap any occurrence of the word regular with tags. Make the following modifications to regex.php: Regular Expression Demo em { background-color: #FF0; border-top: 1px solid #000; border-bottom: 1px solid #000; }
egexes, they will become a powerful tool for pattern matching. TEST_DATA; /* * Use str_replace() to highlight any occurrence of the word * "regular" */ echo str_replace("regular", "regular", $string); /* * Use preg_replace() to highlight any occurrence of the word * "regular" */ echo preg_replace("/regular/", "regular", $string); ?> CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS Executing this script in your browser outputs the test information twice, with identical results (see Figure 9-2). Figure 9-2. The word regular highlighted with both regexes and regular string replacement 315
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THE EXPERT’S VOICE ® IN OPEN SOU
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ii Pro PHP and jQuery Copyright ©
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iv Contents at a Glance ■About th
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vi ■ CONTENTS Understanding jQuer
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viii ■ CONTENTS Summary .........
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x ■ CONTENTS ■Chapter 9: Perfor
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xii About the Author ■ Jason Leng
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xiv Acknowledgments I feel like I s
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C H A P T E R 1 ■ ■ ■ Introdu
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CHAPTER 1 ■ INTRODUCING JQUERY Th
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SETTING UP A LOCAL TESTING ENVIRONM
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google.load("jquery", "1.4.2");
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Basic Selectors CHAPTER 1 ■ INTRO
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Only one paragraph in our document
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$(".foo+p"); CHAPTER 1 ■ INTRODUC
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$("p:odd"); [ p.foo, p#bar ] Select
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$("p:parent"); [ p, p.foo, p, p#bar
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which returns the following in the
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Selecting Only Enabled or Disabled
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26 CHAPTER 2 ■ COMMON JQUERY ACTI
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C H A P T E R 3 ■ ■ ■ Object-
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$obj = new MyClass; var_dump($obj);
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CHAPTER 3 ■ OBJECT-ORIENTED PROGR
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$obj = new MyClass; // Get the valu
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} public function setProperty($newv
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} } return $this->getProperty(); pu
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Create a new object $newobj = new M
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} } // Create a new object $newobj
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Private Properties and Methods CHAP
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} public function __construct() { e
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*/ CHAPTER 3 ■ OBJECT-ORIENTED PR
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Ease of Implementation CHAPTER 3
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C H A P T E R 4 ■ ■ ■ Build a
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CHAPTER 4 ■ BUILD AN EVENTS CALEN
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# # DocumentRoot: The directory out
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CHAPTER 4 ■ BUILD AN EVENTS CALEN
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} ?> } } } CHAPTER 4 ■ BUILD AN E
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■ Note For the sake of brevity, D
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} ?> CHAPTER 4 ■ BUILD AN EVENTS
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} ?> } include_once $filename; CHAP
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private $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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168 CHAPTER 5 ■ ADD CONTROLS TO C
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200 CHAPTER 6 ■ PASSWORD PROTECTI
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P A R T 3 ■ ■ ■ Combining jQu
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236 CHAPTER 7 ■ ENHANCING THE USE
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Page 325: P A R T 4 ■ ■ ■ Advancing jQu
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Page 361 and 362: C H A P T E R 10 ■ ■ ■ Extend
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Page 367 and 368: Adding Methods to jQuery CHAPTER 10
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saving new calendar events in addin
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:eq( ) method, 17, 20, 26-27 equals
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eginning of string, 324 character c
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asic selectors in by class name, 12
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.die( ) method, 75-76 .error( ) met
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.parents( ) method, 33 .parentsUnti
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overview, 328 regex pattern to vali
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