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Asked: 2026-05-10T13:55:36+00:00

How does one go about authoring a Regular Expression that matches against all strings

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How does one go about authoring a Regular Expression that matches against all strings that are valid URIs, while failing to match against all strings that are invalid URIs?

To be specific about what I am referencing when I say URI, I have added a link below for the most current URI RFC standard. It defines the entity that I want to validate using a regular expression.

I don’t need it to be able to parse the URI. I just need a regular expression for validating.

The .Net Regular Expression Format is preferred. (.Net V1.1)

My Current Solution:

^([a-zA-Z0-9+.-]+):(//([a-zA-Z0-9-._~!$&'()*+,;=:]*)@)?([a-zA-Z0-9-._~!$&'()*+,;=]+)(:(\\d*))?(/?[a-zA-Z0-9-._~!$&'()*+,;=:/]+)?(\\?[a-zA-Z0-9-._~!$&'()*+,;=:/?@]+)?(#[a-zA-Z0-9-._~!$&'()*+,;=:/?@]+)?$(:(\\d*))?(/?[a-zA-Z0-9-._~!$&'()*+,;=:/]+)?(\?[a-zA-Z0-9-._~!$&'()*+,;=:/?@]+)?(\#[a-zA-Z0-9-._~!$&'()*+,;=:/?@]+)?$
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1 Answer

  1. This site looks promising: http://snipplr.com/view/6889/regular-expressions-for-uri-validationparsing/

    They propose following regex: 

    /^([a-z0-9+.-]+):(?://(?:((?:[a-z0-9-._~!$&'()*+,;=:]|%[0-9A-F]{2})*)@)?((?:[a-z0-9-._~!$&'()*+,;=]|%[0-9A-F]{2})*)(?::(\d*))?(/(?:[a-z0-9-._~!$&'()*+,;=:@/]|%[0-9A-F]{2})*)?|(/?(?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9A-F]{2})+(?:[a-z0-9-._~!$&'()*+,;=:@/]|%[0-9A-F]{2})*)?)(?:\?((?:[a-z0-9-._~!$&'()*+,;=:/?@]|%[0-9A-F]{2})*))?(?:#((?:[a-z0-9-._~!$&'()*+,;=:/?@]|%[0-9A-F]{2})*))?$/i
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