Searches for a string in a Google Sheets sheet.

SearchString.gs

/* Searches for a string in a sheet*/
function searchString(stringToSearch,sheetName) {
    var sheet=SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
    var selection=sheet.getDataRange();
    var columns=selection.getNumColumns();
    var columnsnames = selection.getColumn()
    var rows=selection.getNumRows();
    for (var column=1; column < columns; column++) {
        for (var row=1; row < rows; row++) {
            var cell=selection.getCell(row,column);
            if (cell.getValue() == stringToSearch ) {
                return true;
            }
        }
    }
}