javascript consonants to lowercase

Question

Hello guys I think the following code should work but it doesn't and I don't know why, any suggestions?

It receives an array with numbers and letters and returns it with lowercase consonants. Numbers remain unchanged Example: consonantstoLowerCase([1,5,7,'a','J','p','E']) returns [1,5,7,'a','j',p,'E']

function consonantstoLowerCase( array )
{

	var result = array.toString().replace(/[bcdfghjklmnpqrstvwxyz]/g, function (char) 
	{
	    return char.toLowerCase();
	});

	console.log(result)
	
}

OUTPUT:

consonantstoLowerCase([1,5,7,'a','J','p','E']) => 1,5,7,a,J,p,E

Thanks in advance!

Answer 1

consonantstoLowerCase([1,5,7,'a','J','p','E','k','m','I'])
function consonantstoLowerCase( array )
{

	var result = array.toString().replace(/[bcdfghjklmnpqrstvwxyz]/ig, function (char) 
	{
	    return char.toLowerCase();
	});

	console.log(result)
	
}