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What challenges did you encounter, and how did you overcome them?

Regular expressions are always a challenge. I'm glad I could write a simple e-mail validator with very short regex.

What specific areas of your project would you like help with?

The error message position was also challenging. If Iput it after the text input, it moves the button in the desktop version, but if I put it after the form, the mobile version is not correct. There are too many possible approaches and i don't know which one is the best.