前提

GAS

内容

forループを入れ子にして、縦横方向に探索しました。

function searchKeyword() {
  const UI = SpreadsheetApp.getUi();
  const ThisSpread = SpreadsheetApp.getActiveSpreadsheet();
  const BeSearchedSheet = ThisSpread.getSheetByName('sheet5');
  for (let vertical = 1; vertical<=3; vertical++){
    for(let horizontal = 1; horizontal <= 3; horizontal++){
      let search_node = BeSearchedSheet.getRange(vertical, horizontal).getValue();
      if(search_node.match('here!')){
         UI.alert('i did it ! => ' + 'vertical:' + vertical + 'horizontal:' + horizontal);
         break;
         }
    }
  }
}