<select class="select abc"> <option>1</option> <option>2</option> </select> <select class="abc select"> <option>1</option> <option>2</option> </select>如何用正则把html片段里select class删掉，保留select标签使其结果为 <select class=" abc"> <option>1</option> <option>2</option> </select> <select class="abc "> <option>1</option> <option>2</option> </select>