Validating web resources
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It is very difficult to validate rich content submitted by a user.
For more information, please see the cheatsheet on Sanitizing HTML Markup with a Library Designed for the Job.
This section provides information on evaluating bibliographic citations, aspects of evaluation, reading evaluation, print vs. Contributors: Dana Lynn Driscoll, Allen Brizee Last Edited: 2018-01-24 The world is full of information to be found—however, not all of it is valid, useful, or accurate.Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.To normalise an email address input, you would convert the domain part ONLY to lowercase.Unfortunately this does and will make input harder to normalise and correctly match to a users intent.