google-diff-match-patch

google-diff-match-patch - Google Code

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.
Diff Demo
Match:
Given a search string, find its best fuzzy match in a block of plain text. Weighted for both accuracy and location.
Match Demo
Patch:
Apply a list of patches onto plain text. Use best-effort to apply patch even when the underlying text doesn't match.
Patch Demo
Currently available in Java, JavaScript and Python. Regardless of language, each library features the same API and the same functionality. All versions also have comprehensive test harnesses.