bug: search bar accepts inputs other than amino strings

[georgeamccarthy]

Describe the bug

• search bar accepts inputs other than amino strings

To Reproduce Steps to reproduce the behavior:

1. Go to site
2. search for lsdkaajf;du09u329iof'psodjff'asjfsda($£)($8490328
3. It doesn't complains, find a protein.

Expected behavior

• Application should give a warning if input is not a-z / A-Z
• Should be compatible with spaces, commas and no gaps.

Additional context Why does it work with punctuation?

[Rubix982]

We can use the built in re package from python to solve this.