两个字符串之间的正则表达式

Question

How would I get the "$0.00" in between this font tag?

<font color="#99002B">
$0.00
</font>

This is the only one on the page I want to get.

I really don't understand regex, so maybe someone could help whilst they answer too!

Thanks

EDIT: The $ sign isn't always there either. It might be, for example;

EUR 0,00 £ 4.44

Answer 1

You've asked for a regular expression here, but it's not the right tool for parsing HTML.

$doc = new DOMDocument;
$doc->loadHTML($html); // Load your HTML data

$xpath = new DOMXPath($doc);
$node  = $xpath->query("//font[@color='#99002B']")->item(0);
echo $node->nodeValue; //=> "$0.00"

Working Demo

Answer 2

/<font color="#99002B">\n?(.+[0-9]+\.[0-9]+)\n?<\/font>/

Working demo: http://refiddle.com/refiddles/53efdb3b75622d2c63940500

If there are some more spaces around use:

/<font color="#99002B">\s*(.+[0-9]+\.[0-9]+)\s*<\/font>/

Maybe you have to replace all "\\n" by "" before it works - haven't tested.