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