April 2017
Intermediate to advanced
628 pages
13h 46m
English
Content preview from C# 7 and .NET Core Cookbook - Second Edition
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Dynamic regex matching
What does dynamic regex matching even mean? Well, it isn't an official term, but it is a term we use to explain a regex that uses variables at runtime to generate a specific expression. Assume for a minute that you are working on a document-management system that needs to implement versioning of documents for a company called ACME Corporation. To do this, the system validates that the document has a valid filename.
A business rule states that the filename of any file uploaded on a specific day must be prefixed with acm (for ACME) and today's date in the yyyy-mm-dd format. They can be only text files, Word documents (only .docx) and Excel documents (only .xlsx). Any documents not conforming to this file format are processed ...
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