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This is a non-breaking change. Very few classes implement Pattern, so it's also a mostly non-intrusive change. If we add startIndex to other methods, like replaceFirstMatch, we can use the extra parameter only for non-zero start indices without breaking existing code. R=ajohnsen@google.com Review URL: https://codereview.chromium.org//460613002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39119 260f80e4-7a28-3924-810f-c04153c831b5