Regular Expression Examples 

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

In This Section

• 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 of the form mm/dd/yy with dates of 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 containing a URL. For example, "https://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 a String is in Valid E-Mail Format
  Provides an example that you can use to verify that a string is in valid e-mail format.

Reference

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

Related Sections

• Regular Expressions as a Language
  Provides an overview of the programming language aspect of regular expressions.

• Regular Expression Classes
  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 Elements
  Provides information on the set of characters, operators, and constructs that you can use to define regular expressions.