The Diff Match and Patch libraries offer robust algorithms to perform the operations required for synchronizing plain text. Diff: Compare two blocks of plain text and efficiently return a list of differences. Match: Given a search string, find its best fuzzy match in a block of plain text. Weighted for both accuracy and location. Patch: Apply a list of patches onto plain text. Use best-effort to apply patch even when the underlying text doesn't match. WWW: https://github.com/diff-match-patch-python/diff-match-patch