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run code in 500+ PHP versions simultaneously
<?php $str = '<p>"bla" bla</p>'; echo preg_replace( '~<p>\W*\K\w~', '<span class="first_letter">$0</span>', $str );
Output for git.master, git.master_jit, rfc.property-hooks
<p>"<span class="first_letter">b</span>la" bla</p>

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