有效地使用xpath检测价格

I need to scan the page for price and extract it, i was thinking of detecting $ and extract the value after $. How can i do that using xpath?

Unfortunately different page has different format. Therefore i need it to be smart enough to detect $12 or $12.30

$price= $xpath->query("//??[@??]");

Thanks in advance!

With XPath 2.0, you could use:

//*[text()[contains(., '$')]]/substring-after(text(),'$')