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@ 2014-09-19T17:23:41Z

<?php
$pattern = '~(?:(?<=<p class="code">\v)|(?!\A)\G\v*)^((?>(?!</p>)\V)*)(\v)~m';

$str = '
<p>hello see my css below</p>
<p class="code">
h1 { 
font-size:10px
font-color:#FFF
}

h2 { 
font-size:10px
font-color:#FFF
}
</p>

<p>123</p>
<p class="code">
1
2
3
</p>';

$str = preg_replace($pattern, '<code>\1</code>\2', $str);

echo $str;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive preview

35.98 ms | 402 KiB | 5 Q