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86c890bcec
Fixes #717 (partially) The previous implementation of the smart-case feature was actually *too* smart, in that it inspected the final character ranges in the AST to determine if the pattern contained upper-case characters. This meant that patterns like `foo\w` would not be handled case-insensitively, since `\w` includes the range of upper-case characters A–Z. As a medium-term solution to this problem, we now inspect the input pattern itself for upper-case characters, ignoring any that immediately follow a `\`. This neatly handles all of the most basic cases like `\w`, `\S`, and `É`, though it still has problems with more complex features like `\p{Ll}`. Handling those correctly will require improvements to the AST.
grep
This is a library that provides grep-style line-by-line regex searching (with
comparable performance to grep itself).