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PHP Regex - Hex color codes. - PHP Code Bank

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PHP Regex - Hex color codes.
This script checks if $string is a valid Hex color code. 
                <?php
	$string = "#FF0000";
	
	if (preg_match('/^#(?:(?:[a-f\d]{3}){1,2})$/i', $string)) 
	{
		echo "This is a valid HEX Color code!";
	}
	else
	{
		echo "This is not a valid HEX Color code!";
	}
?>
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