Make :contains() be optionally case insensitive

[yehuda]

At the moment, :contains() is case sensitive only.

We need a way to make it optionally case insensitive.

[joern]

This could easily be added when required:

$.extend($.expr:?, {

"contains-ic": "jQuery.fn.text.apply([a])toLowerCase().indexOf(m[3].toLowerCase())>=0",

});

Untested, but pretty simple.

[weaverryan]

If anybody's looking for a tested version of the above:

	jQuery.extend(jQuery.expr[':'], {
		"contains-ic": "jQuery.fn.text.apply([a]).toLowerCase().indexOf(m[3].toLowerCase())>=0",
	});