Breaks if a data-field starts with a punctuation mark

[johnaweiss]

Describe the bug
Output is "undefined", and fields get mixed together unpredictably.

To Reproduce

<mt-records>
     NAME
     INFO

     Richard
     , owner of T-Bone Motors...
</mt-records>


<template>
     [[NAME]][[INFO]]
</template>

Expected output
Richard, owner of T-Bone Motors...

Actual output
undefined

Additional context
Probably due to field-delimiter reg ex.

Possible Fix
Add or punctuation to the field-delimiter reg ex.