怎么控制在正则替换时，保留原来的值
如何控制在正则替换时，保留原来的值
$s =
TXT;
像上面这种我要改成：
$s =
TXT;
就是把有些02135.pdf.htm,02136.pdf.txt这类pdf的后缀去掉
我的想法是替换成空，不知道这个方法好不好，但是其他的值的控制我就不会了
- PHP code
<!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
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-->
$s = ('/<div id="divPdf.*?title=" .. echo>
<br>我是这样写的，不过貌似没有成功<br><br><br><font color="#e78608">------解决方案--------------------</font><br>
<fieldset>
<legend>探讨</legend>
<br>楼上正解<br>如果我想把<div id="divPdf3" title="前面这里加上来确保修改的是<div id = .... pdf 这些行呢.</fieldset> <div class=" clear>
</div>
</fieldset>
</div>
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