從一些html代碼preg_match

Question

我將如何在php中編寫一個php preg_match（）來挑選出250值。我有一大串html代碼，我想從中選出250個，我似乎無法獲得正確的表達式。

這是我想匹配的HTML模式 - 注意，我要提取的整數，其中250爲：

<span class="price-ld">H$250</span>

我一直在嘗試了幾個小時要做到這一點，我不能讓它工作大聲笑

Answer 1

這是你要找的正則表達式：

(?<=<span class="price-ld">H\$)\d+(?=</span>) 

你可以看到的結果here。

而這裏的解釋：

Options: case insensitive;^and $ match at line breaks 

Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) «(?<=<span class="price-ld">H\$)» 
    Match the characters 「<span class="price-ld">H」 literally «<span class="price-ld">H» 
    Match the character 「$」 literally «\$» 
Match a single digit 0..9 «\d+» 
    Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» 
Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=</span>)» 
    Match the characters 「</span>」 literally «span>» 

Answer 2

preg_match('/<span class="price-ld">H$(\d+)<\/span>/i', $your_html, $matches); 
print "Its ".$matches[1]." USD"; 

正則表達式實際上取決於您的代碼。你到底在哪裏搜索？