Extract the difference between two strings in Java

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google-diff-match-patch

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.

Currently available in Java, JavaScript, Dart, C++, C#, Objective C, Lua and Python. Regardless of language, each library features the same API and the same functionality. All versions also have comprehensive test harnesses.

There is a Line or word diffs wiki page which describes how to do line-by-line diffs.

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