Build me a web app ( Car Pool application - JAVA )

Web app should include: finding patterns using regular expressions, translation of HTML to text, finding keywords using string matching, use of inverted index, analyzing frequencies using hash tables or search trees, using large dictionaries/datasets, sorting techniques, search trees, spellchecking keywords or HTML files, and many others.

UI should be similar to bla bla website
https://www.blablacar.in/