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MariaDB [(none)]> select regexp_replace('<img src="" alt="" width="233" height="300" class="alignnone size-medium wp-image-3517" />','(?<!<a href=[^>]*>)(<img src=.*wp-image-(\\d+)[^>]*>)','<a href="\\2" rel="attachment wp-att-\\2">\\1</a>') as regexp_replace_result;
ERROR 1139 (42000): Got error 'lookbehind assertion is not fixed length at offset 18' from regexp
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