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$A = 'ABCD ab EFGAHjanm';

$Pkey = preg_replace( '/a/iU','<strong style="color: red">\\0</strong>',$A );

echo $Pkey;
?>

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$A = 'ABCD ab EFGAHjanm';

echo $Pkey = preg_replace( '/a.+a/iU','<strong style="color: red">\\0</strong>',$A );
echo '<br>';
echo $Pkey = preg_replace( '/a.+a/i','<strong style="color: red">\\0</strong>',$A );


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