How do I write a regex to extract emails from messy text?

A solid starting pattern:

Code:

[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}

But the real skill is the trade-offs:
- Too loose → matches "a@b" and random noise
- Too strict → misses valid ones like a+b@example.co.uk
- Always test against messy real data – my record is 3 edge cases in the first 100 rows

Handy trick: iterate live against sample strings with the regex tester on tools.php instead of guessing.

What's your go-to email regex – and what edge case did it fail on?