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Regular Expression Examples

.NET Framework 4.5

This section contains code examples that illustrate the use of regular expressions in common applications.

Note
The System.Web.RegularExpressions namespace contains a number of regular expression objects that implement predefined regular expression patterns for parsing strings from HTML, XML, and ASP.NET documents. For example, the TagRegex class identifies start tags in a string and the CommentRegex class identifies ASP.NET comments in a string.

Example: Scanning for HREFs: Provides an example that searches an input string and prints out all the href="…" values and their locations in the string.
Example: Changing Date Formats: Provides an example that replaces dates in the form mm/dd/yy with dates in the form dd-mm-yy.
How to: Extract a Protocol and Port Number from a URL: Provides an example that extracts a protocol and port number from a string that contains a URL. For example, "http://www.contoso.com:8080/letters/readme.html" returns "http:8080".
How to: Strip Invalid Characters from a String: Provides an example that strips invalid non-alphanumeric characters from a string.
How to: Verify that Strings Are in Valid Email Format: Provides an example that you can use to verify that a string is in valid email format.

System.Text.RegularExpressions: Provides class library reference information for the .NET Framework System.Text.RegularExpressions namespace.

.NET Framework Regular Expressions: Provides an overview of the programming language aspect of regular expressions.
The Regular Expression Object Model: Describes the regular expression classes contained in the System.Text.RegularExpression namespace and provides examples of their use.
Details of Regular Expression Behavior: Provides information about the capabilities and behavior of .NET Framework regular expressions.
Regular Expression Language - Quick Reference: Provides information on the set of characters, operators, and constructs that you can use to define regular expressions.

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