求好手帮忙，正则过滤时把有用的内容也过滤了
求高手帮忙，正则过滤时把有用的内容也过滤了。
睁开的绿色眼眸中爆发出了惊人的绿色闪光，瞬间吓跑了围困住垃圾堆的野狗群。<span class="watermark">@-=%=更-多精彩^小说=，尽&在纵横*中文网~$|~*</span></p><p>看着狂吠着逃离垃圾堆的野狗群，垃圾堆下的未知生物眼中的光亮立刻委顿下来，被垃圾堆彻底掩盖的身体动了动，尝试着在垃圾堆下找到一个更舒服的姿势。<span class="watermark">@-=%=更-多精彩^小说=，尽&在纵横*中文网~$|~*</span></p><p>“哎，枉我一世英明，
用PHP正则怎么过滤这里的@-=%=更-多精彩^小说=，尽&在纵横*中文网~$|~* 里面的内容是随便变的，我用$str=preg_replace('/(.*?)<\/span>/isU','',$r_con[$setting['cap_content_html_rule']][0]);过滤后把中间一大部分内容也过滤了
请高手帮忙
------解决方案--------------------
str=preg_replace('/(.*?)<\/span>/is','',$r_con[$setting['cap_content_html_rule']][0]);
------解决方案--------------------
<br />
$str=<<<html<br />
睁开的绿色眼眸中爆发出了惊人的绿色闪光，瞬间吓跑了围困住垃圾堆的野狗群。<span class="watermark">@-=%=更-多精彩^小说=，尽&在纵横*中文网~$<br><font color='#FF8000'>------解决方案--------------------</font><br>~*</span></p><p>看着狂吠着逃离垃圾堆的野狗群，垃圾堆下的未知生物眼中的光亮立刻委顿下来，被垃圾堆彻底掩盖的身体动了动，尝试着在垃圾堆下找到一个更舒服的姿势。<span class="watermark">@-=%=更-多精彩^小说=，尽&在纵横*中文网~$<br><font color='#FF8000'>------解决方案--------------------</font><br>~*</span></p><p>“哎，枉我一世英明，<br />
html;<br />
<br />
echo preg_replace('/<span[^\/]+\/span>/','',$str);<br />
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