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Parsing and Regular Expression Basics

Parsing helps us to extract the information we need from the mounds of data available. Regular expressions assist us in the hunt. This four-part article series will show you how to use Perl with regular expressions to accomplish your parsing tasks. It is excerpted from chapter one of the book Pro Perl Parsing, written by Christopher M. Frenz (Apress; ISBN: 1590595041).

TABLE OF CONTENTS:
  1. Parsing and Regular Expression Basics
  2. Parsing and Lexing
  3. Using Regular Expressions
  4. Pattern Matching
By: Apress Publishing
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May 20, 2010

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The dawn of a new age is upon us, an information age, in which an ever-increasing and seemingly endless stream of new information is continuously generated. Information discovery and knowledge advancements occur at such rates that an ever-growing number of specialties is appearing, and in many fields it is impossible even for experts to master everything there is to know. Anyone who has ever typed a query into an Internet search engine has been a firsthand witness to this information explosion. Even the most mundane terms will likely return hundreds, if not thousands, of hits. The sciences, especially in the areas of genomics and proteomics, are generating seemingly insurmountable mounds of data.

Yet, one must also consider that this generated data, while not easily accessible to all, is often put to use, resulting in the creation of new ideas to generate even more knowledge or in the creation of more efficient means of data generation. Although the old adage “knowledge is power” holds true, and almost no one will deny that the knowledge gained has been beneficial, the sheer volume of information has created quite a quandary. Finding information that is exactly relevant to your specific needs is often not a simple task. Take a minute to think about how many searches you performed in which all the hits returned were both useful and easily accessible (for example, were among the top matches, were valid links, and so on). More than likely, your search attempts did not run this smoothly, and you needed to either modify your query or buckle down and begin to dig for the resources of interest.

Thus, one of the pressing questions of our time has been how do we deal with all of this data so we can efficiently find the information that is currently of interest to us? The most obvious answer to this question has been to use the power of computers to store these giant catalogs of information (for example, databases) and to facilitate searches through this data. This line of reasoning has led to the birth of various fields of informatics (for example, bioinformatics, health informatics, business informatics, and so on). These fields are geared around the purpose of developing powerful methods for storing and retrieving data as well as analyzing it.

In this book, I will explain one of the most fundamental techniques required to perform this type of data extraction and analysis, the technique of parsing. To do this, I will show how to utilize the Perl programming language, which has a rich history as a powerful text processing language. Furthermore, Perl is already widely used in many fields of informatics, and many robust parsing tools are readily available for Perl programmers in the form of CPAN modules. In addition to examining the actual parsing methods themselves, I will also cover many of these modules.



 
 
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