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322 CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS don’t need to include both uppercase and lowercase versions of the letters. Without the modifier, you would need to use [A-Ca-c] to match either case of the three letters. Figure 9-5. Any character from A-C is highlighted Matching Any Character Except... To match any character except those in a class, prefix the character class with a caret (^). To highlight any characters except A-C, you would use the pattern /([^a-c])/i (see Figure 9-6). Figure 9-6. Highlighting all characters, except letters A-C ■ Note It’s important to mention that the preceding patterns enclose the character class within parentheses. Character classes do not store backreferences, so parentheses still must be used to reference the matched text later.
Using Character Class Shorthand CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS Certain character classes have a shorthand character. For example, there is a shorthand class for every word, digit, or space character: • Word character class shorthand (\w): Matches patterns like [A-Za-z0-9_] • Digit character class shorthand (\d): Matches patterns like [0-9] • Whitespace character class shorthand (\s): Matches patterns like [ \t\r\n] Using these three shorthand classes can improve the readability of your regexes, which is extremely convenient when you’re dealing with more complex patterns. You can exclude a particular type of character by capitalizing the shorthand character: • Non-word character class shorthand (\W): Matches patterns like [^A-Za-z0-9_] • Non-digit character class shorthand (\D): Matches patterns like [^0-9] • Non-whitespace character class shorthand (\S): Matches patterns like [^ \t\r\n] ■ Note \t, \r, and \n are special characters that represent tabs and newlines; a space is represented by a regular space character ( ). Finding Word Boundaries Another special symbol to be aware of is the word boundary symbol (\b). By placing this before and/or after a pattern, you can ensure that the pattern isn’t contained within another word. For instance, if you want to match the word stat, but not thermostat, statistic, or ecstatic, you would use this pattern: /\bstat\b/. Using Repetition Operators When you use character classes, only one character out of the set is matched, unless the pattern specifies a different number of characters. Regular expressions give you several ways to specify a number of characters to match: • The star operator (*) matches zero or more occurrences of a character. • The plus operator (+) matches one or more occurrences of a character. • The special repetition operator ({min,max}) allows you to specify a range of character matches. Matching zero or more characters is useful when using a string that may or may not have a certain piece of a pattern in it. For example, if you want to match all occurrences of either John or John Doe, you can use this pattern to match both instances: /John( Doe)*/. 323
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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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264 CHAPTER 8 ■ EDITING THE CALEN
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Page 325: P A R T 4 ■ ■ ■ Advancing jQu
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Page 367 and 368: Adding Methods to jQuery CHAPTER 10
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.die( ) method, 75-76 .error( ) met
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overview, 328 regex pattern to vali
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