如何取出一段字符串中的链接

求助：怎么取出一段字符串中的链接
把下面一段字符串中的href地址取出来：

<a href="www.1.com" target="_blank">文章标题</a><br />
<a href="www.2.com" target="_blank">1-1</a> <a href="www.3.com" target="_blank">1-2</a> <a href="www.4.com" target="_blank">1-3</a>

需要得到这样的格式：

<i>www.1.com</i><i>www.2.com</i><i>www.3.com</i><i>www.4.com</i>

谢谢！

分享到：

------解决方案--------------------

$s=<<
<a href="www.1.com" target="_blank">文章标题</a><br />
<a href="www.2.com" target="_blank">1-1</a> <a href="www.3.com" target="_blank">1-2</a> <a href="www.4.com" target="_blank">1-3</a>

txt;

preg_match_all('#href="(.+?)"#s',$s,$m);

echo '
'.implode('
',$m[1]).'
';

------解决方案--------------------

$str = '文章标题
1-1 1-2 1-3';
preg_match_all('',$str,$val);
foreach($val[1] as $v){
    $newstr[]= "$v";
}
print_r(implode("",$newstr));

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