Anki: move part of field to different field, or remove unwanted content from a field

update field.py

# Open the debug console with Ctrl+: (which is Ctrl+Shift+; on US keyboards)
# (Don't have the browser window open when you do.)
# Run it with Ctrl+Enter
# Remove the # from the last line to actually save the changes

s = r'regular expression to search for goes here'
srcField = 'Source Field Name goes here'
tgtField = 'Target Field Name goes here'
noteType = 'Name of the Note Type goes here'

# Get the model, and then the list of notes of that type
theModel = mw.col.models.byName(noteType)
theNotes = mw.col.models.nids(theModel)

# Run through the list of notes
for nid in theNotes:
  # Get the note contents
  note = mw.col.getNote(nid)
  # Search the source field for the regexp
  m = re.search(s, note[srcField])
  # If there's a match...
  if (m):
    #... show what it found
    print(m.group(0))
    #... add it to the target field (comment out if just clearing unwanted content)...
    note[tgtField] = m.group(0)
    #... and remove it from the source field
    note[srcField] = re.sub(s, '', note[srcField])
    # save the changes
    #note.flush()