1:要匹配的html
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>无标题文档</title> 6 </head> 7 <body> 8 <ul class="product_category"> 9 <li class="cate expand"> 10 <h3 class="cat-hd"><a href="/product-138893.shtml" target="_blank">铝板</a></h3> 11 <ul class="cat-bd"> 12 <li><a href="/product-138896.shtml" target="_blank">7075铝板</a></li> 13 <li><a href="/product-138898.shtml" target="_blank">7A12T4铝板</a></li> 14 <li><a href="/product-138899.shtml" target="_blank">7A04铝板</a></li> 15 <li><a href="/product-138900.shtml" target="_blank">6082铝板</a></li> 16 <li><a href="/product-138901.shtml" target="_blank">6063铝板</a></li> 17 <li><a href="/product-138902.shtml" target="_blank">6061T651铝板</a></li> 18 <li><a href="/product-138903.shtml" target="_blank">6061铝板</a></li> 19 <li><a href="/product-138904.shtml" target="_blank">5083铝板</a></li> 20 <li><a href="/product-138965.shtml" target="_blank">5A02铝板</a></li> 21 <li><a href="/product-138905.shtml" target="_blank">5052铝板</a></li> 22 <li><a href="/product-138906.shtml" target="_blank">5052神户铝板</a></li> 23 <li><a href="/product-138907.shtml" target="_blank">2A12铝板</a></li> 24 <li><a href="/product-138908.shtml" target="_blank">2024铝板</a></li> 25 <li class="last"><a href="/product-138909.shtml" target="_blank">1060铝板</a></li> 26 </ul> 27 </li> 28 29 <li class="cate"> 30 <h3 class="cat-hd"><a href="/product-138544.shtml" target="_blank">钢材</a></h3> 31 </li> 32 33 <li class="cate collapse"> 34 <h3 class="cat-hd"><a href="/product-138895.shtml" target="_blank">铝管</a></h3> 35 <ul class="cat-bd"> 36 <li><a href="/product-138919.shtml" target="_blank">6063铝管</a></li> 37 <li><a href="/product-138954.shtml" target="_blank">6061铝管</a></li> 38 <li><a href="/product-138952.shtml" target="_blank">5052铝管</a></li> 39 <li><a href="/product-138911.shtml" target="_blank">3003铝管</a></li> 40 <li><a href="/product-138964.shtml" target="_blank">2A12铝管</a></li> 41 <li class="last"><a href="/product-138960.shtml" target="_blank">1060铝管</a></li> 42 </ul> 43 </li> 44 45 <li class="cate collapse"> 46 <h3 class="cat-hd"><a href="/product-138894.shtml" target="_blank">铝棒</a></h3> 47 <ul class="cat-bd"> 48 <li><a href="/product-225433.shtml" target="_blank">6061铝棒</a></li> 49 <li><a href="/product-138942.shtml" target="_blank">7A04铝棒</a></li> 50 <li><a href="/product-138967.shtml" target="_blank">6082铝棒</a></li> 51 <li><a href="/product-138966.shtml" target="_blank">6063铝棒</a></li> 52 <li><a href="/product-138920.shtml" target="_blank">5083铝棒</a></li> 53 <li class="last"><a href="/product-138912.shtml" target="_blank">2a12铝棒</a></li> 54 </ul> 55 </li> 56 57 <li class="cate"> 58 <h3 class="cat-hd"><a href="/product-138544.shtml" target="_blank">铝方</a></h3> 59 </li> 60 </ul> 61 62 63 </body> 64 </html>
2：正则
1 $cateReg = '/class="cates*S*?">([Ss*]+?)[^>]</li>/';
要测试的在线工具 ： http://regexpal.isbadguy.com/