(Verbesserungen)

[Raketeningrid]

str='123\u00A0456\u00A0789.123';
console.log( str + ' : ' + mkCleanNumber( str ) );
str='123 456 789.123'
console.log( str + ' : ' + mkCleanNumber( str ) );
str='123 456 789.123';
console.log( str + ' : ' + mkCleanNumber( str ) );

function mkCleanNumber( s ) {
	return parseFloat( 
		s.replace( /&#[0-9a-fx]*;/ig, '' ).replace( /[^0-9.]/g, '' )
	);
}

function mkCleanNumber( s ) {
	return parseFloat( 
		s.replace( /&#[0-9a-fx]*;/ig, '' ).replace( /[^0-9.]/g, '' )
	);
}

Ausgaben:

123 456 789.123               : 123456789.123
123 456 789.123 : 123456789.123
123 456 789.123   : 123456789.123