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<?php function filter_ingredients($elements) { return implode(', ', array_filter(preg_split('/,\s*/', $elements), function ($v) { return !preg_match('/^no\b/', $v); })); } echo filter_ingredients("cheese, no tomato, no onion, mayo, no lettuce") . "\n"; echo filter_ingredients("no cheese, tomato, no onion, no&nbsp;mayo, lettuce") . "\n"; echo filter_ingredients("no cheese, no&nbsp;tomato, onion, no mayo, no lettuce") . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
cheese, mayo tomato, lettuce onion

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