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<?php $selfTable = 'songs'; $relTable = 'artists'; $strings = array( 'id', 'artists.name', '$artist.real_name', '$title' ); foreach($strings as $string) { echo preg_replace_callback('#((?P<both>[^\$]+)|\$(?P<self_field>[\w]+)|\$(?P<table>[\w]+)\.(?P<field>[\w]+))#', function($match) { print_r($match); }, $string); }
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => id [1] => id [both] => id [2] => id ) Array ( [0] => artists.name [1] => artists.name [both] => artists.name [2] => artists.name ) Array ( [0] => $artist [1] => $artist [both] => [2] => [self_field] => artist [3] => artist ) Array ( [0] => .real_name [1] => .real_name [both] => .real_name [2] => .real_name ) Array ( [0] => $title [1] => $title [both] => [2] => [self_field] => title [3] => title )

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