PHP REGEX: Get Image from URL

Question

What I want

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If the URL in the string contains a .jpg at the end of the URL (not the string) then it should make an image from it with preg_replace else make a normal link.

so for example:

If I have http://www.example.com/images/photo.jpg then it should replace with:

<img src="http://www.example.com/images/photo.jpg" alt="http://www.example.com/images/photo.jpg"&gt;

The problem:

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The URL is replaced with a link in any way and my regex isn't working :( .

What I have tried:

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        $content = preg_replace("/(http:\/\/[^\s]+(?=\.jpg))/i","<img src=\"$1\" alt = \"$1\"></img>",$content);    

        $content = nl2br(preg_replace("/(http:\/\/[^\s]+(?!\.jpg))/m", "<a href=\"$1\" rel=\"nofollow\" target=\"blank\" title=\"$1\" class=\"news-link\">$1</a>", $content));

Answer 1

$content = preg_replace('#\b(http://\S+\.jpg)\b#i', '<img src="$1" alt="$1" />', $content);

Answer 2

You don't need lookaround. Just go with

$content = preg_replace("#(http://[^ ]+\\.jpg(?= |$)#i","<img src=\"$1\" alt=\"$1\"/>", $content);    

Answer 3

I think you used the lookahead operator when you wanted lookbehind. You could change (?=\.jpg) to (?<=\.jpg) but there are other, cleaner regex's I'm sure others will post.

Answer 4

Try this

function replace_links($content)
{
    if (preg_match('#(http://[^\s]+(?=\.(jpe?g|png|gif)))#i', $content))
    {
        $content = preg_replace('#(http://[^\s]+(?=\.(jpe?g|png|gif)))(\.(jpe?g|png|gif))#i', '<img src="$1.$2" alt="$1.$2" />', $content);
    }
    else
    {
        $content = preg_replace('#(http://[^\s]+(?!\.(jpe?g|png|gif)))#i', '<a href="$1" rel="nofollow" target="blank" title="$1" class="news-link">$1</a>', $content);
    }

    return $content;
}