Preface
This book is about a powerful tool called "regular expressions". It teaches you how
to use regular expressions to solve problems and get the most out of tools and
languages that provide them. Most documentation that mentions regular expressions
doesn't even begin to hint at their power, but this book is about mastering
regular expressions.Regular expressions are available in many types of tools (editors, word processors,
system tools, database engines, and such), but their power is most fully exposed
when available as part of a programming language. Examples include Java and
JScript, Visual Basic and VBScript, JavaScript and ECMAScript, C, C++, C#, elisp, Perl,
Python, Tcl, Ruby, PHP, sed, and awk. In fact, regular expressions are the very
heart of many programs written in some of these languages.There's a good reason that regular expressions are found in so many diverse languages
and applications: they are extremely powerful. At a low level, a regular
expression describes a chunk of text. You might use it to verify a user's input, or
perhaps to sift through large amounts of data. On a higher level, regular expressions
allow you to master your data. Control it. Put it to work for you. To master
regular expressions is to master your data. |
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