Download e-book for iPad: Mastering Regular Expressions (3rd Edition) by Jeffrey E. F. Friedl

By Jeffrey E. F. Friedl

Regular expressions are a really strong instrument for manipulating textual content and knowledge. they're now typical positive aspects in a variety of languages and renowned instruments, together with Perl, Python, Ruby, Java, VB.NET and C# (and any language utilizing the .NET Framework), Hypertext Preprocessor, and MySQL.

in the event you don't use general expressions but, you will find during this booklet an entire new international of mastery over your facts. in the event you already use them, you'll have fun with this book's unheard of aspect and breadth of assurance. for those who imagine you recognize all you want to learn about average expressions, this ebook is a beautiful eye-opener.

As this publication indicates, a command of standard expressions is a useful ability. commonplace expressions let you code complicated and refined textual content processing that you simply by no means imagined may be computerized. commonplace expressions can prevent time and aggravation. they are often used to craft based options to quite a lot of difficulties. as soon as you've mastered ordinary expressions, they'll develop into a useful a part of your toolkit. you are going to ask yourself the way you ever acquired by way of with out them.

but regardless of their broad availability, flexibility, and exceptional strength, normal expressions are often underutilized. but what's strength within the fingers of knowledgeable might be fraught with peril for the unwary. Mastering common Expressions may help you navigate the minefield to changing into a professional and assist you optimize your use of normal expressions.

Mastering usual Expressions, 3rd variation, now contains a complete bankruptcy dedicated to personal home page and its robust and expressive suite of normal expression capabilities, as well as more advantageous Hypertext Preprocessor insurance within the significant "core" chapters. additionally, this variation has been up-to-date all through to mirror advances in different languages, together with elevated in-depth insurance of Sun's java.util.regex package deal, which has emerged because the usual Java regex implementation.Topics include:
* A comparability of positive factors between various types of many languages and tools
* How the typical expression engine works
* Optimization (major reductions to be had here!)
* Matching simply what you will want, yet no longer what you don't want
* Sections and chapters on person languages

Written within the lucid, exciting tone that makes a posh, dry subject turn into crystal-clear to programmers, and sprinkled with strategies to complicated real-world difficulties, Mastering normal Expressions, 3rd version deals a wealth details so you might positioned to quick use.

Reviews of this re-creation and the second one edition:

"There isn't a greater (or extra invaluable) booklet on hand on commonplace expressions."

--Zak Greant, dealing with Director, eZ Systems

"A actual tour-de-force of a ebook which not just covers the mechanics of regexes in remarkable aspect but in addition talks approximately potency and using regexes in Perl, Java, and .NET...If you utilize average expressions as a part of your specialist paintings (even when you have already got an outstanding booklet on no matter what language you're programming in) i'd strongly suggest this ebook to you."

--Dr. Chris Brown, Linux Format

"The writer does a great task prime the reader from regex beginner to grasp. The publication is very effortless to learn and chock packed with worthy and correct examples...Regular expressions are precious instruments that each developer must have of their toolbox. Mastering average Expressions is the definitive consultant to the topic, and a good source that belongs on each programmer's bookshelf. Ten out of Ten Horseshoes."

--Jason Menard, Java Ranch

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Additional resources for Mastering Regular Expressions (3rd Edition)

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09 # add in 9% tax Multiline Comment You can create a comment that spans any number of lines. You do this by having one line with three quote marks (single or double quotes), any number of comment lines, and ending with the same three quote characters (single or double quotes), as follows: ''' A multiline comment starts with a line of three quote characters (above) This is a long comment block It can be any length You do not need to use the # character here 30 CHAPTER 2 ■ VARIABLES AND ASSIGNMENT STATEMENTS You end it by entering the same three quotes you used to start (below) ''' There are times when you are experimenting with code that you may want to temporarily comment out a block of code.

Py program and apply this additional naming convention. Here is the original code: 28 CHAPTER 2 ■ VARIABLES AND ASSIGNMENT STATEMENTS numberOfOneDollarBills = 3 numberOfFiveDollarBills = 2 total = numberOfOneDollarBills + (numberOfFiveDollarBills * 5) Figure 2-8. Replace Dialog box. print 'Total amount is', total Apply this new naming convention to make it look like this: nOneDollarBills = 3 nFiveDollarBills = 2 total = nOneDollarBills + (nFiveDollarBills * 5) print 'Total amount is', total If you want, you can do this by making changes on each line.

Syntax Error The first type of error is a compile error (the generic name in programming), which is known as a syntax error in Python. Consider the following two-line program: learningPython = True print learningpython When this program is run, we see this: Traceback (most recent call last): File "", line 2, in print learningpython NameError: name 'learningpython' is not defined This is called a traceback, a term that won’t make a lot of sense right now. For now, just recognize that this is a Python error message.

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