Google Sheets unusual Kanji color changer

function changeColor() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  ss.getSheets().forEach(function(sheet) {
    var rows = sheet.getMaxRows();
    var columns = sheet.getMaxColumns();
    var values = sheet.getRange(2, columns, rows).getValues();
    for (i = 0; i < rows - 2; i++) {
      var regex = /^\D+\d\.\D+Usually written using kana alone.*/g;
      if(regex.test(values[i][0])) {
        sheet.getRange(i + 2, 1).setBackgroundRGB(235, 235, 235);
      }
    }
  });
}