Question 254589 in PHP Question posted in
Official manual can be found here.

Php – Modifying this regex to match img src, alt and title in any order

I have this regex to match image src tags and also alt or title tags, but it works only if the src is first, how should I modify it to match these 3 in any order ?
Or are there more accurate ways to do this by parsing html elements ? I assume by regex I might get back array elements but without knowing which is what.

For example now it matches:

img src="landscape.jpg" title="My landscape"

but not

img title="My landscape" src="landscape.jpg"

current regex is:

preg_match_all('#<imgs+[^>]*src="([^"]*)"(?:s+[^>]*(?:alt|title)="([^"]+)")?[^>]*>#is', $url_contents, $image_matches);
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I found a simple example using DOMDocument: It does just what I wanted and seems way more reliable than what I tried by regex.

    <?php

$dom = new DOMDocument();
      
// Loading HTML content in $dom
@$dom->loadHTMLFile($url);
  
// Selecting all image i.e. img tag object
$anchors = $dom -> getElementsByTagName('img');
  
// Extracting attribute from each object
foreach ($anchors as $element) {
      
    // Extracting value of src attribute of
    // the current image object
    $src = $element -> getAttribute('src');
      
    // Extracting value of alt attribute of
    // the current image object
    $alt = $element -> getAttribute('alt');
      
    // Extracting value of height attribute
    // of the current image object
    $height = $element -> getAttribute('height');
      
    // Extracting value of width attribute of
    // the current image object
    $width = $element -> getAttribute('width');
      
    // Given Output as image with extracted attribute,
    // you can print value of those attributes also
    echo '<img src="'.$src.'" alt="'.$alt.'" height="'. $height.'" width="'.$width.'"/>';
}
    
?>

  2. 0

    You could use:

    (?<=<img)(?: (src|title|alt)="([^"]+)")?(?: (src|title|alt)="([^"]+)")?(?: (src|title|alt)="([^"]+)")?
    • (?<=<img) – behind me is an <img start tag
    • (?: (src|title|alt)="([^"]+)")? – look for a src, title, or alt attribute followed by its value and place them into capture groups
    • (?: (src|title|alt)="([^"]+)")? – again
    • (?: (src|title|alt)="([^"]+)")? – again

    https://regex101.com/r/GXyAZf/1

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search