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<?php $re = '/(?:([\t ])\1{1,})|(?:(\n\n)\n+)/m'; $str = ' Сегодня вечером фцвфцвфцвфцв '; $subst = '$1$2'; $result = preg_replace($re, $subst, $str); echo trim($result);
Output for git.master, git.master_jit, rfc.property-hooks
Сегодня вечером фцвфцвфцвфцв

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