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源自：3-7 [正则表达式] 元字符之原子的筛选方式

regex問題

請問下面html怎樣才可獲得12557637001？我想到的是開始為(?<=bc_4)

希望指點

<ul><li><span><a href="/cell-phones-service-plans-accessories/b/ref=dp_bc_1/135-5574408-5805717?ie=UTF8&node=2335752011">

                Cell Phones & Accessories

            </a></span></li><li><span>

             ›

         </span></li><li><span><a href="/cell-phone-accessories/b/ref=dp_bc_2/135-5574408-5805717?ie=UTF8&node=2407755011">

                Accessories

            </a></span></li><li><span>

             ›

         </span></li><li><span><a href="/chargers-charging-cables/b/ref=dp_bc_3/135-5574408-5805717?ie=UTF8&node=2407761011">

                Chargers & Power Adapters

            </a></span></li><li><span>

             ›

         </span></li><li><span><a href="/Cell-Phone-Wall-Chargers/b/ref=dp_bc_4/135-5574408-5805717?ie=UTF8&node=12557637011">

                 Wall Chargers

             </a></span></li></ul>

提问者：慕斯卡8255803 2018-03-14 17:43

个回答

  • 飞哥传说3
    2018-03-15 15:21:59

    $html=<<<HTML

                        <ul><li><span><a href="/cell-phones-service-plans-accessories/b/ref=dp_bc_1/135-5574408-5805717?ie=UTF8&node=2335752011">


                    Cell Phones & Accessories


                </a></span></li><li><span>


                 ›


             </span></li><li><span><a href="/cell-phone-accessories/b/ref=dp_bc_2/135-5574408-5805717?ie=UTF8&node=2407755011">


                    Accessories


                </a></span></li><li><span>


                 ›


             </span></li><li><span><a href="/chargers-charging-cables/b/ref=dp_bc_3/135-5574408-5805717?ie=UTF8&node=2407761011">


                    Chargers & Power Adapters


                </a></span></li><li><span>


                 ›


             </span></li><li><span><a href="/Cell-Phone-Wall-Chargers/b/ref=dp_bc_4/135-5574408-5805717?ie=UTF8&node=12557637011">


                     Wall Chargers


                 </a></span></li></ul>

    HTML;

                $pattern = '/&node=\d+">/';

                $matches = array();

                $res = preg_match_all($pattern,$html,$matches);

                $r = end($matches[0]);

                $r = substr($r,6,-2);

                echo $r;


    0
  • 飞哥传说3
    2018-03-15 11:18:28

    &node=\d{11}">

    0