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$s =<<< TXT
<img src="www.abc/n1/n2/images/abc.jpg">
<img src="images/abc.jpg">
<img src="www.abc/n1/images/www/abc.jpg">
TXT;
echo preg_replace('#(?<=").+/(images/[^"]+)#', '$1', $s);
<img src="images/abc.jpg">
<img src="images/abc.jpg">
<img src="images/www/abc.jpg">
$s =<<< TXT
<img src="www.abc/n1/n2/images/abc.jpg">
<img src="images/abc.jpg">
<img src="www.abc/n1/images/www/abc.jpg">
TXT;
echo preg_replace('#(?<=").+/(images/[^"]+)#', '$1', $s);
<img src="images/abc.jpg">
<img src="images/abc.jpg">
<img src="images/www/abc.jpg">