Download Regular Expressions Cookbook by Jan Goyvaerts, Steven Levithan PDF

By Jan Goyvaerts, Steven Levithan

This cookbook offers greater than a hundred recipes that can assist you crunch info and manage textual content with common expressions. each programmer can locate makes use of for normal expressions, yet their strength doesn't come worry-free. Even professional clients usually be afflicted by terrible functionality, fake positives, fake negatives, or confusing insects. commonplace Expressions Cookbook bargains step by step directions for essentially the most universal projects concerning this software, with recipes for C#, Java, JavaScript, Perl, personal home page, Python, Ruby, and VB.NET.

With this publication, you'll:
Understand the fundamentals of standard expressions via a concise educational Use usual expressions successfully in different programming and scripting languages the best way to validate and structure enter deal with phrases, strains, specified characters, and numerical values locate ideas for utilizing common expressions in URLs, paths, markup, and knowledge alternate examine the nuances of extra complicated regex beneficial properties know how usual expressions' APIs, syntax, and behaviour vary from language to language Write higher ordinary expressions for customized needs.

Whether you're a beginner or an skilled consumer, standard Expressions Cookbook can assist deepen your wisdom of this exact and irreplaceable software. You'll study strong new tips, keep away from language-specific gotchas, and shop worthwhile time with this large library of confirmed options to tricky, real-world difficulties.

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Additional resources for Regular Expressions Cookbook

Sample text

One is a plug-in for Eclipse, and the other is a plug-in for IntelliJ IDEA. com/tools/reanimator (Figure 1-7) won’t bring a dead regex back to life. Rather, it’s a fun little tool that shows a graphic representation of the finite state machines that a regular expression engine uses to perform a regular expression search. 16 | Chapter 1: Introduction to Regular Expressions reAnimator’s regex syntax is very limited. It is compatible with all the flavors discussed in this book. Any regex you can animate with reAnimator will work with any of this book’s flavors, but the reverse is definitely not true.

Com (Figure 1-6) offers an online regex tester. It’s a Java applet that runs in your browser. The Java 4 (or later) runtime needs to be installed on your computer. regex package to evaluate 14 | Chapter 1: Introduction to Regular Expressions Figure 1-6. com your regular expressions, which is new in Java 4. In this book, the “Java” regex flavor refers to this package. Type your regular expression into the Regular Expression box. Use the Flags menu to set the regex options you want. Three of the options also have direct checkboxes.

Allow an a or e to be used in each of the vowel positions. Create another regular expression to match a single hexadecimal character. Create a third regex to match a single character that is not a hexadecimal character. NET, Java, JavaScript, PCRE, Perl, Python, Ruby Discussion The notation using square brackets is called a character class. A character class matches a single character out of a list of possible characters. The three classes in the first regex match either an a or an e. They do so independently.

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