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<?php $str = "&lt;p>This is a good text, but it's very tedious. &lt;/p>"; $str = preg_replace("/(?<!\.\s*?)&lt;\/p>/", "$1.&lt;\/p>", $str); echo $str;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Compilation failed: lookbehind assertion is not fixed length at offset 0 in /in/Rf8O2 on line 4

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