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Perhaps they validate the passwords client side before hashing. The user could bypass the restrictions pretty easily by modifying the JavaScript of the website, but the password would not be transmitted un-hashed.
It is worth pointing out that nearly any password restriction like this can be made ineffective by the user anyway. Most people who are asked to put a special character in the password just add a ! to the end. I think length is still a good validation though and it runs into the same issue @[email protected] is asking about
How would they validate individual characters client side? The set password is on the server.
When you are filling out the web form with your password it's stored plain text in the web browser and accessible via JavaScript. At that point, a JavaScript function checks the requirements like length and then does the salting/hashing/etc and sends the result to the server.
You could probably come up with a convoluted scheme to check requirements server side, but it would weaken the strength of the hash so I doubt anyone does it this way. The down side of the client side checking is that a tenacious user could bypass the password requirements by modifying the JavaScript. But they could also just choose a dumb password within the requirements so it doesn't matter much... "h4xor!h4xor!h4xor!" Fits most password requirements I have seen but is probably tried pretty quickly by password crackers.
OP asked about validating specific characters of the password. Commenter then said it has to be stored in plain text for that to work. Then you commented about client-side validation. Which I really don't see has anything to do with the stuff before in this thread?
Commenter said it has to be plain text server side. You implied validating client side would allow storing hashed passwords and still validating individual characters of the password. Which I asked how that would work. Your answer to that seems to give a general view of password handling on forms and validation?