Pattern Matching with Regular Expressions

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If you’re a programmer new to regular expressions, this easy-to-follow guide is a great place to start. You’ll learn the fundamentals step-by-step with the help of numerous examples, discovering first-hand how to match, extract, and transform text by matching specific words, characters, and patterns. Regular expressions are an essential part of a programmer’s toolkit, available in various Unix utlilities as well as programming languages such as Perl, Java, JavaScript, and C#.

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CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS em { background-color: #FF0; border-top: 1px solid #000; border-bottom: 1px solid #000; } Regular Expression Testing In this document, there is a lot of text that can be matched using regex. The benefit of using a regular expression is much more flexible — albeit complex — syntax for text pattern matching. After you get the hang of regular expressions, also called regexes, they will become a powerful tool for pattern matching. TEST_DATA; /* * Use regex to highlight any occurence of the letters...

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CHAPTER 9 ■■■ Performing Form Validation with Regular Expressions It’s your responsibility as a developer to ensure that your users’ data is useful to your app, so you need to ensure that critical information is validated before storing it in your database. In the case of the calendar application, the date format is critical: if the format isn’t correct, the app will fail in several places.

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