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<?php $keyword = "o negative blood donor in khulna"; $pattern = "/(?i)\b[abo]\s+(?:posi|nega)tive\b|\S+/"; preg_match_all($pattern, $keyword, $keyword_array); print_r($keyword_array[0]);
Output for rfc.property-hooks, git.master, git.master_jit
Array ( [0] => o negative [1] => blood [2] => donor [3] => in [4] => khulna )

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