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<?php $txt = '!1 aaa !2 bb bb !5 cc cc cc !4 dd'; echo preg_replace('~!(\d+)\s*(.*?)\s*(?=!\d|$)~s', "<div class=\"x\$1\">\$2</div>\n", $txt);

This is an error 500

Value for `_results` contains invalid data `array`


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