Example for code review: http://codereview.stackexchange.com/questions/121963/filtering-the-attributes-for-a-custom-tag/121969#121969

gistfile1.txt

<cfscript>
struct function stripNonDataNgAndJsAttributes( required struct attributes ) {
    var patternToKeep = "^((data|ng)\-|on)\S";

    return attributes.filter( function( key, value ){
        return key.reFindNoCase( patternToKeep );
    } );
}

string function structToQueryString( required struct input ) {
    return input.reduce( function( result, key, value ){
        return result & ' #key.lCase()#="#value.encodeForHTMLAttribute()#"';
    }, "" );
}

attributes = {
      "data-test" = "test"
    , "ng-dang"   = "fubar"
    , "onSubmit"  = "yes"
    , test        = 0
};

filtered = stripNonDataNgAndJsAttributes( attributes );
qs       = structToQueryString( filtered );

WriteOutput( qs );
</cfscript>