If you were going to write a script to do something with these URLs (like visit each URL and download the target image), you would have two options: 1. The dynamic (changing) parts are highlighted, whereas the static (unchanging) parts are not highlighted. Another way to think of it is the URL changes for each picture that the links point to. For example, consider the following set of URLs: The element in this case is the URL, where different parts of the URL change with each succession. These changes may occur with each page load, or with each successive instance of that element. When dealing with web pages, regular expressions come in particular use when trying to find an element that follows a pattern, but that element may have a few changing parts to it. You can think of regular expressions as wildcards on steroids (). 1Ĥ REGULAR EXPRESSIONS A regular expression (regex or regexp for short) is a special text string for describing a search pattern.
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It will cover, in depth, what each field is and how to format the field. The next section explains the interface to the host file editor. However, what the section will do is help you to understand what regular expressions are and why they are used. You will not be a master simply by reading through that section, hence the reason I provide external links for further instruction. The following section is a brief introduction to regular expressions.
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9 The Interface URL Pattern Search Pattern The ID Directive The REPLACE Directive Using the Regular Expressions Using a Function to Handle the Search iģ INTRODUCTION The purpose of this manual is to hopefully familiarize you with enough understanding of regular expressions and my host file editor to get you on the road to adding your own hosts. 8 Further Instruction in Regular Expressions. 2 Special Characters in Regular Expressions. 1 ImageHost Grabber Host File Editor Manual Written By: Matthew McMullen Revised: January 09, 2010Ģ CONTENTS Introduction.
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