使用preg_match_all从HTML获取项目

Question

I have a number of items in a table, formatted like this

<td class="product highlighted">
Item Name
</td>

and I am using the following PHP code

$regex_pattern = "/<td class=\"product highlighted\">(.*)<\/td>/";
preg_match_all($regex_pattern,$buffer,$matches);
print_r($matches);

I am not getting any output, yet I can see the items in the html.

Is there something wrong with my regexp?

Answer 1

Apart from your using regex to parse HTML, yes, there is something wrong: The dot doesn't match newlines.

So you need to use

$regex_pattern = "/<td class=\"product highlighted\">(.*?)<\/td>/s";

The /s modifier allows the dot to match any character, including newlines. Note the reluctant quantifier .*? to avoid matching more than one tag at once.

Answer 2

In order to match your example, you will need to add the dot all flag, s , so the . will match newlines.

Try the following.

$regex_pattern = "/<td class=\"product highlighted\">(.*?)<\/td>/s";

Also note that I changed the capture to non-greedy, (.*?) . It's best to do so when matching open ended text.

It's worth noting regular expressions are not the right tool for HTML parsing, you should look into DOMDocument . However, for such a simple match you can get away with regular expressions provided your HTML is well-formed.