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

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324 CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS Matching one or more characters is good for verifying that at least one character was entered. For instance, if you want to verify that a user enters at least one character into a form input and that the character is a valid word character, you can use this pattern to validate the input: /\w+/. Finally, matching a specific range of characters is especially useful when matching numeric ranges. For instance, you can use this pattern to ensure a value is between 0 and 99: /\b\d{1,2}\b/. In your example file, you use this regex pattern to find any words consisting of exactly four letters: /(\b\w{4}\b)/ (see Figure 9-7). Figure 9-7. Matching only words that consist of exactly four letters Detecting the Beginning or End of a String Additionally, you can force the pattern to match from the beginning or end of the string (or both). If the pattern starts with a caret (^), the regex will only match if the pattern starts with a matching character. If it ends with a dollar sign ($), the regex will match only if the string ends with the preceding matching character. You can combine these different symbols to make sure an entire string matches a pattern. This is useful when validating input because you can verify that the user only submitted valid information. For instance, you can you can use this regex pattern to verify that a username contains only the letters A-Z, the numbers 0-9, and the underscore character: /^\w+$/. Using Alternation In some cases, it’s desirable to use either one pattern or another. This is called alternation, and it’s accomplished using a pipe character (|). This approach allows you to define two or more possibilities for a match. For instance, you can use this pattern to match either three-, six-, or seven-letter words in regex.php: /\b(\w{3}|\w{6,7})\b/ (see Figure 9-8).
CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS Figure 9-8. Using alternation to match only three-, six-, and seven-letter words Using Optional Items In some cases, it becomes necessary to allow certain items to be optional. For instance, to match both single and plural forms of a word like expression, you need to make the s optional. To do this, place a question mark (?) after the optional item. If the optional part of the pattern is longer than one character, it needs to be captured in a group (you’ll use this technique in the next section). For now, use this pattern to highlight all occurrences of the word expression or expressions: /(expressions?)/i (see Figure 9-9). Figure 9-9. Matching a pattern with an optional s at the end 325
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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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.parents( ) method, 33 .parentsUnti
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overview, 328 regex pattern to vali
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