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Regex List


The following table contains a list of very useful regular expressions which can be used in C#/.NET or other RegEx-capable programming languages. Be aware that the expressions in the table are designed for .NET and may use .NET-specific sequences!

RegEx-Tester is an extremely useful litte tool which may help developing and validating complex regular expressions.


@"<\s*(\w+)\s*((""|').*?(""|')|[^'"">]+)*?\s*>"Matches any string that looks like a XML / HTML tag (while ignoring contents of strings).

Groups[1] = Tagname
@"^([\w0-9_\-\.]+)@([\w0-9_\-\.]+?)\.(\w{2,})"Matches an email address.

Groups[1] = Name
Groups[2] = Domain
Groups[3] = TLD
@"^([a-z]:\\)?([^\\\n]+\\)*?([^\\\n]+)$"Matches a file path

Groups[1] = Drive (if absolute path)
Groups[2] = Array of directories (if present)
Groups[3] = Filename
@"^((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.){3,3}(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])$"Validates a IP Address (incl. IP range)

Groups[2] = Class C Network
Groups[3] = Class C Host
@"^((0|128|192|224|240|248|252|254|255)\.){3,3}(0|128|192|224|240|248|252|254|255)"Validates a Subnet-Mask (incl. valid range)
or (german):
Username (3-16 characters, starting with letter or underscore)
@"^((([A-z]+)://)?(\w+:\w+@)?(([\w\.\-~]+\.)?[\w\.\-~]+)(:\d+)?)?(/([^\n#?!$&'\(\)\[\]/:;=@]+?/)*([^\n#?!$&'\(\)\[\]/:;=@]+)?(\?([\w%]+?=[\w%]+\&)*[\w%]+?=[\w%]+)?(#[\w%]+)?)?$"Validates a URL (relative and absolute) in detail.

Groups[3] = Protocol
Groups[5] = username:password
Groups[6] = Serveraddress
Groups[9] = Port
Groups[11] = Array of resource path
Groups[12] = Resourcename
Groups[13] = Parameter-String
Groups[15] = Text Anchor



Example of usage:



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