Strip commas from the $INPUT record of NONMEM model code
strip_input_commas.RdComma-separated $INPUT items are valid NONMEM but not accepted by
Pharmpy, which expects space-separated column names. This replaces commas
inside the $INPUT record with spaces, leaving other records (e.g. the
comma-containing $THETA/$OMEGA bounds) untouched. Matching stops at the
next record boundary ($).