Customizing Format Phone rule

I'd like to modify the below so that the phone number is set to Bold and a larger font size after the area code. I've been able to Bold the whole thing, but not specifically after the area code. Thank you for any and all help.

if(CaseSelection == "Format 2")

{

var formatStyle01 = "$1-$2"; //simple 7 digit phone

var formatStyle02 = "$1-$2-$3"; //simple 10 digit phone

var formatStyle03 = "+$1 $2-$3-$4"; //10 digit phone starts with 1

var formatStyle04 = "$1-$2-$3 ext.$4"; //10 digit phone with extension

var formatStyle05 = "+$1 $2-$3-$4 ext.$5"; //10 digit phone starts with 1 with extension

var formatStyle06 = "$1-$2 ext.$3"; //7 digit phone with extension

var thisNumber = Field(Var1);

return formatNumber(Trim(thisNumber));

}

You don't say what larger point size you want to use, but you can do something like this and put whatever you want in the tags in the second line:

var thisNumber = Field("Phone");
var afterAreaCodeTags = "<z newsize=12>";

var formatStyle01 = afterAreaCodeTags + "$1-$2";             //simple 7 digit phone
var formatStyle02 = "$1-" + afterAreaCodeTags + "$2-$3";            //simple 10 digit phone
var formatStyle03 = "+$1 $2-" + afterAreaCodeTags + "$3-$4";        //10 digit phone starts with 1
var formatStyle04 = "$1-" + afterAreaCodeTags + "$2-$3 ext.$4";        //10 digit phone with extension
var formatStyle05 = "+$1 $2-" + afterAreaCodeTags + "$3-$4 ext.$5";    //10 digit phone starts with 1 with extension
var formatStyle06 = afterAreaCodeTags + "$1-$2 ext.$3";        //7 digit phone with extension

return formatNumber(Trim(thisNumber));

Or, you could use the <magnify> tag, again with a customizable factor, like so:

var thisNumber = Field("Phone");
var afterAreaCodeTags = "<magnify factor=200>";

var formatStyle01 = afterAreaCodeTags + "$1-$2";             //simple 7 digit phone
var formatStyle02 = "$1-" + afterAreaCodeTags + "$2-$3";            //simple 10 digit phone
var formatStyle03 = "+$1 $2-" + afterAreaCodeTags + "$3-$4";        //10 digit phone starts with 1
var formatStyle04 = "$1-" + afterAreaCodeTags + "$2-$3 ext.$4";        //10 digit phone with extension
var formatStyle05 = "+$1 $2-" + afterAreaCodeTags + "$3-$4 ext.$5";    //10 digit phone starts with 1 with extension
var formatStyle06 = afterAreaCodeTags + "$1-$2 ext.$3";        //7 digit phone with extension

return formatNumber(Trim(thisNumber)) + "</magnify>";

Remember to check the "Treat returned strings as tagged text" box.