And what kind of form validation are you going to do with a regular expression? ...

porridgeraisin · 2025-07-04T17:21:03 1751649663

For what it's worth, the inbuilt HTML5 validation that implementw input type=email does have a regex in the spec.

  /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/

But it is true that you can implement it with a FSM(which is what firefox does). Webkit uses a regex as well I think.

drowsspa · 2025-07-04T17:52:43 1751651563

Yeah, for all intents and purposes that's the spec for emails now

littlestymaar · 2025-07-05T07:43:42 1751701422

TIL thanks.

remram · 2025-07-04T18:25:39 1751653539

Me? None. I'm not the one proposing the use of Rust and WASM for form validation.

What kind of validation are you going to do without a regular expression?

littlestymaar · 2025-07-06T09:27:03 1751794023

> What kind of validation are you going to do without a regular expression?

Actual form validation… I can't even think of a single kind of form validation where a regex would help…

zoechi · 2025-07-04T18:05:15 1751652315

The bigger and more complex the application, the less is the effect of this.