[6.4] Match literal at end of sub-character substring - #914

[6.4] Match literal at end of sub-character substring#914

natecook1000 merged 2 commits into

release/6.4.xswiftlang/swift-experimental-string-processing:release/6.4.xfrom

fix/6.4-substring-sub-character-endswiftlang/swift-experimental-string-processing:fix/6.4-substring-sub-character-endCopy head branch name to clipboard