On: Password Requirements: Myths and Madness

[throwawaaarrgh]

Password manager password generators have a simple UI you can click to select the password format required by the form. Or just click 'generate' again and try each until one works.

[alanfranz → throwawaaarrgh]

So, you need to bother, either to reverse-engineer the site requirements, or to try until it works.

For no good reason, as explained in the article.