Search for text, make it bold

This code (below) is supposed to search text for a specific string (defined by regex), and if found, make the string bold. It finds and returns the text it's looking for, but when it applies the character format, it changes the entire paragraph, not just the string. So, I think it's the text range/text selection that I'm having trouble with. I've spent too much time trying to figure this out on my own, but I just can't get it. Can someone please help me?

I'm using FrameMaker 2019. Thank you!

#target framemaker 

var doc = app.ActiveDoc; 

var pgf = doc.TextSelection.beg.obj; 

processLinks (pgf, doc); 

function processLinks (pgf, doc) { 

    var end = Constants.FV_OBJ_END_OFFSET - 1, begin = 0, textRange, charTag; 

    var textList = pgf.GetText (Constants.FTI_CharPropsChange); 

    for (var i = textList.length - 1; i >= 0; i -= 1) { 

        begin = textList[i].offset; 

        if (begin !== end) { 

            textRange = new TextRange (new TextLoc (pgf, begin), new TextLoc (pgf, end)); 

            num = getFigOrTable (pgf); 

                if (num) { 

                    alert (num); //this is the string that matches the regex.

                           applyCharFmt (textRange, "Bold", doc); // makes whole para bold, nut just num

           }

            end = begin; 

        } 

    } 

    if (end > 0) { 

        textRange = new TextRange (new TextLoc (pgf,0), new TextLoc (pgf,end)); 

         num = getFigOrTable (pgf); 

                if (num) { 

                    alert (num); //this is the string that matches the regex.

                    applyCharFmt (textRange, "Bold", doc);

        }

    } 

}

function getFigOrTable (pgf) {   

 var doc; 

    doc = app.ActiveDoc;  

  var regex, pgfText, match;

    regex = /(?:Figure|Table|Plate) ((AF|AT|[FTP])(\d+))/;  // Match figure or table and number in text. 

    pgfText = getText (pgf, doc); 

    if (regex.test (pgfText) === true) { 

        match = pgfText.match (regex); 

        return (match); // this returns Figure F1, F1, F, 1

    }        

}  

function getText (textObj, doc) {   

    // Gets the text from the text object or text range.  

    var text = "", textItems, i; 

    // Get a list of the strings in the text object or text range. 

    if (textObj.constructor.name !== "TextRange") { 

        textItems = textObj.GetText(Constants.FTI_String); 

    } else { 

         textItems = doc.GetTextForRange(textObj, Constants.FTI_String); 

    } 

    // Concatenate the strings. 

    for (i = 0; i < textItems.len; i += 1) { 

        text += (textItems[i].sdata); 

    } 

    return text; // Return the text 

} 

function applyCharFmt (textRange, name, doc) { 

     var charFmt = 0; 

     charFmt = doc.GetNamedCharFmt (name); 

    if (charFmt.ObjectValid()) { 

        doc.SetTextProps (textRange, charFmt.GetProps()); 

    } 

}