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Introduction to Regular Expressions (Scripting)

Windows Scripting 5.8

Updated: January 2010

These topics introduce the concept of regular expressions and explain how to create and use them.

A regular expression describes one or more strings to match when you search a body of text. The expression serves as character pattern to compare with the text being searched. You can use regular expressions to search for patterns in a string, replace text, and extract substrings.

Uses for Regular Expressions

Illustrates circumstances that would benefit from the use of regular expressions.

Creating a Regular Expression

Explains how to construct a regular expression.

Regular Expression Programming

Provides code examples that show how to search for patterns in a string, replace text, and extract substrings.

Regular Expression Syntax

Summarizes the elements that make up the regular expression syntax and provides examples.

Lists of Matching Characters

Describes how to match a single character from a list of characters or range of characters.

Quantifiers

Explains how to search for a character or set of characters that is repeated a specific number of times.

Anchors

Explains how to specify that a pattern that you are searching for has to appear either at the start or end of the searched string, or the start or end of a line or word in the searched string.

Alternation and Subexpressions

Explains how to specify a choice between two or more alternatives in a regular expression. Also explains how to create a subexpression.

Backreferences

Explains how to refer to a subexpression from within a regular expression, and from within a replacement string.

JScript User's Guide (Windows Scripting - JScript)

Provides information about how to use JScript and includes a guide to regular expressions.

VBScript User's Guide

Provides information about how to use VBScript and includes a guide to regular expressions.

Date

History

Reason

January 2010

Modified topic descriptions.

Information enhancement.

August 2009

Modified topic descriptions.

Information enhancement.

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Microsoft RegExp not installed - IIS5
How do I get Microsoft RegExp installed on IIS5?

I get this from the XCENT (xcDiag.asp) script on my server:
It reveals that RegExp is not installed on the server & it is required.
I do have an app that fails to work correctly complaining about this.

How do I get this installed?

===
Component            Type    Installed    Req    Opt    Information
Microsoft RegExp        Misc.    No            X    

Microsoft RegExp:
The Microsoft Regular Expression object is required. This is a critical component that must be installed for an ASP application's advanced features to function.
===

* XCENT info: http://www.xcent.com/downloads/default.asp?file=15
History