Search bar function in shiny

Hi there - I'm fairly new to Shiny and am trying to create a search bar function but I can't figure out 1) the right function to use and 2) how to connect the input with the output. I would like to create a search bar in which a person can input a word in a string from a certain set of variables/columns, and get an output of information from that observation's row (or information from selected variables in that row). Any suggestions on how I should proceed? Thanks!