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Get substring between characters - help


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When one of my end users fills out a form then need to use the barcode scanner. An example of the text would be "%247463$1$0$4$20%". My script below is suppose to extract everything after  the first two characters up to the last character. It works but it is also showing the original along with it.

<script>

    function modify()
    {
        //Store the value in the field to trim.
        var trim = document.getElementsByName("InsertRecordBarcode")[0].value;
        //Take a substring of trim and store it back into new trim value.
        trim = trim.match("%2(.*)%");
        //Set the value of the weight field in the form to the new substring 
        document.getElementsByName("InsertRecordBarcode")[0].value = trim;
        //the new value in the field is what is submitted.
    }
    //When the form is submitted called method modify.
    document.getElementById("caspioform").onsubmit=modify;
</script>

 

My result showing is "%247463$1$0$4$20%,47463$1$0$4$20". What am I doing wrong as I want it to only show the 47463$1$0$4$20.

thank you.

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try to remove the value of the text field before assigning new value

    function modify()
    {
        //Store the value in the field to trim.
        var trim = document.getElementsByName("InsertRecordBarcode")[0].value;
        //Take a substring of trim and store it back into new trim value.
        trim = trim.match("%2(.*)%");
        //Set the value of the weight field in the form to the new substring 
document.getElementsByName("InsertRecordBarcode")[0].value = "";
        document.getElementsByName("InsertRecordBarcode")[0].value = trim;
        //the new value in the field is what is submitted.
    }

 

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