Question

php正则获取href的链接

<a href="./28263973/?i=1&from=CpG-based" rel="chapter" ref="linksrc=docsum_title">CpG-based immunotherapy impairs antitumor activity of BRAF inhibitors in a B-cell-dependent manner.</a>
<a href="./28220116/?i=2&from=CpG-based#fft" ref="link_id=fft">Full text</a>
两个a标签只想获取rel="chapter"的链接

Answer 1

使用正则中的子模式，按给出的代码匹配的话大概是这样

$pattern='/href=\"([^(\}>)]+)\"/';

然后使用preg_match或者preg_match_all如果替换的话使用preg_replace即可