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The specific issue is that -w causes the regex to be wrapped in Unicode word boundaries. Regrettably, Unicode word boundaries are the one thing our regex engine can't handle well in the presence of non-ASCII text. We work around its slowness by stripping word boundaries in some circumstances, and using the resulting expression as a way to produce match candidates that are then verified by the full original regex. This doesn't fix all cases, but it should fix all cases where -w is used. |
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grep
This is a library that provides grep-style line-by-line regex searching (with
comparable performance to grep itself).