replaced regex - keep track of position when matching instead

[mueslimak3r]

Changes

• replaced regex for turning list of matched frames -> start, end frames.
  Replaced by the frame matching logic having the frames just keep track of their own number.
  This should result in far fewer errors, and a marginal speedup

Issues

• the regex used to take the matched frames and turn them into start and end frames was buggy and often resulted in the wrong start time.

Notes

• sorry for all the edits. There was some weirdness with comparing branches