正則表達式突出顯示搜索字詞

Question

可能重複：
Highlight keywords in a paragraph

我一直在HTML或純文本字符串突出的搜索字詞的想法中掙扎。我看到很多例子，只是不起作用，所以這裏是我的破解。請給我一些情況下，這將打破HTML或不會工作。我能想到的唯一兩種情況是：如果在文本字符串中有「>我不是計算機」和格式不正確的html。所以這是代碼。謝謝你，我希望它可以幫助別人

function search_highlight($text,$search_terms) 
{ 
    $color = array('#FFFF00','#00FFFF','#FF9900','#00FF00','#CCCCCC','red','grean','orange'); 
    $count = 0; 

    if (! is_array($search_terms)) 
    { 
    $search_terms = explode(' ', $search_terms); 
    } 

    // Highlight each of the terms 
    foreach ($search_terms as $term) 
    { 
    //skip blank terms that arise from double spaces 
    if(! $term) continue; 

    //Regex Explained: 
    //The regex first matches a word boundary 
    //Next it matches the search term liternal 
    //Next it matches a word boundary 
    //Next is matches, but doesn't include the following regex... 
    //Anything other than the literals <and> zero or more times 
    //Next it will match either a < literal or the end of the string 
    $text = preg_replace('/\b('.preg_quote(trim($term)).')\b(?=[^><]*<|.$)/i', '<span style="background-color:'.$color[$count].'">\1</span>', $text); 

    //increment counter for new color 
    $count++; 
} 
return $text; 
} 

Answer 1

我會用DOMDocument類這一點，簡單地做對節點內容的純文本替換，而不是試圖想出一個忍者正則表達式。