$string = '<section>
text1 name1</br>
text2 name2</br>
text3 name3</br>
text4 name4</br>
text5 name5</br>
</section>';
echo preg_replace('/name([0-9]+)/', '<img src="pic$1.jpg">', $string);

RewriteEngine on
RewriteRule ^topic,([0-9\.]+)$ /forum/single.php?id=$1 [QSA,L]
RewriteRule ^topic=([0-9\.]+)$ /forum/single.php?id=$1 [QSA,L]

<?php

$string = 'zoomfile="/data/attachment/forum/201806/27/054302lgqcp5s5h0z5cqcz.jpg" file="/data/attachment/forum/201806/27/054302lgqcp5s5h0z5cqcz.jpg"';

preg_match_all("/\/data\/attachment\/forum(.*?)\.jpg/", $string, $matches);

echo "<pre>";
var_dump(array_unique($matches[0]));

RewriteCond {REQUEST_FILENAME} !-f
RewriteCond {REQUEST_FILENAME} !-d
RewriteRule ^archives/([0-9]+)(/.*|$) archives.php?id=$1&slug=$2 [QSA,L]

#default wp cond & rule
RewriteRule ^index\.php$ - [L]

url: yoursite.com/archives/12/fucking-cms-system-you-should-consider 

matches: 
id: 12, slug: fucking-cms-system-you-should-consider

# รองรับ
yoursite.com/archives/id
yoursite.com/archives/id/slug

<?php var_dump($_GET);

<?php

$html = &#39;<img src="http://www.mydomain/image1_200x200.jpg" alt="xxx" /><h2>Title</h2><img src="http://www.mydomain/image2.jpg" alt="yyy" /><img src="http://www.mydomain/image3.jpg" />&#39;;

echo preg_replace(&#39;/<img(.*?)200x200(.*?)\/>/i&#39;,&#39;&#39;,$html);

preg_match('/<img(.*?)200x200(.*?)>/i',$html,$match);
echo isset($match[0]) ? str_replace($match[0], '', $html) : 'not found image';