Mastering regular expressions in C# and JavaScript

I've created a regular expression in JavaScript to validate email addresses.

/^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

Currently, I have implemented client-side validation in my project. However, based on a recommendation, I am looking to add server-side validation as well.

This is the modified version of my regex in C#:

 @"^([A-Za-z0-9]([-._\w]*[0-9a-zA-Z])*@([A-Za-z0-9][-\w]*[A-Za-z0-9]\.)+[A-Za-z]{2,9})";

I want the C# code to function exactly like the JavaScript code.

If anyone can assist me in making this adjustment, it would be greatly appreciated.

p.s: If this platform is solely for criticizing rather than helping with technical questions (as has been my experience in recent months), please guide me to a more supportive community for basic assistance.

Answer №1

To mimic JavaScript's regex behavior, simply use the pattern as is without delimiters:

@"^([A-Za-z0-9_\-.])+@([A-Za-z0-9_\-.])+\.([A-Za-z]{2,4})$"

(There's no need to escape the @ or the dot within a character class in .NET or JavaScript.)

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