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create table test ( html text ); insert into test values ('text before <nav>много разного текста включая разные html теги</nav> text after'), ('aaa<nav>aaa</nav>aaa'); select * from test; update test set html = replace( html, concat('<nav>', substr( html, locate('<nav>', html, 1) + 5, locate('</nav>', html, locate('<nav>', html, 1))-locate('<nav>', html, 1) - 5 ), '</nav>'),'<nav></nav>'); select * from test;
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