email regex

Email regex

Email is a classic regex intent. Here the focus stays on testing the pattern and understanding its practical limits.

Test text

Matches2

[email protected] not-an-email [email protected]

Explanation

Match word boundary, then word character, then one or more times, then '@', then word character, then one or more times, then literal '.', then word character, then quantified by {2,}, then word boundary

\bword boundary
\wword character
+one or more times
@literal '@'
\wword character
+one or more times
\.escaped '.'
\wword character
{2,}quantifier {2,}
\bword boundary

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What this regex covers

The pattern covers simple emails for quick form testing and demos.
It does not try to validate the full RFC complexity, which would be unfriendly and hard to maintain.

Email examples

Simple address

Input: [email protected]
Expected output: match

Basic use case.

Invalid

Input: not-an-email
Expected output: sem match

Helps illustrate the pattern limit.

Full tool FAQ

Does the tool test regex patterns with flags and examples?

Yes. The idea is to let you build the expression, apply flags and inspect matches in real time, which is especially useful for debugging, learning and fine-tuning patterns.

What is regex?

What is regex used for in practice?

What are regex flags?

Can regex validate any complex format?

Why do some regex patterns become too slow?

Is there such a thing as a perfect email regex?

What is the most common mistake when learning regex?

Frequently asked questions

Does the regex validate every possible email?

No. This page uses a pragmatic and readable pattern for common cases.

Can I edit the pattern?

Yes. Even in focused mode, the field remains editable so you can test variations.