选择选项值中具有部分匹配的选项

my dropdown is like

我的下拉就像

<select id="taskType">
    <option value="xyz:1">Employee Name</option>
    <option value="abc:2">Employee Name</option>
    <option value="123:3">Employee Name</option>
    <option value="efg:4">Employee Name</option>
    <option value="hij:5">Employee Name</option>
   </select>
<select id="tas