I have this HTML and need help writing an XpathQueryString

Question

I am trying to write an XPath to pull the value 4.4690 from the tag below. Any help will be appreciated.

<div id=currency_converter_result>10 BRL = <span class=bld>4.4690 USD</span>
   <input type=submit value="Convert">
</div>

Answer 1

查找跨度的文本，然后使用substring-before()提取USD之前的文本部分：

substring-before(//div[@id="currency_converter_result"]/span[@class="bld"], " USD")