Broaden use of SearchValues in TryFindNextPossibleStartingPosition in Regex #89205
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… Regex SearchValues has been updated to have an ASCII fast-path for inputs that are not only ASCII. This means we can simplify TryFindNextPossibleStartingPosition in Regex to not track AsciiSet specially and instead just increase the number of characters we query the set for (from 5 to 128). That way, we'll use SearchValues rather than emitting our own helper up until a (semi-arbitrary) point where we deem it impossible or infeasible to enumerate all the chars that make up the set.
MihaZupan
approved these changes
Jul 19, 2023
src/libraries/System.Text.RegularExpressions/gen/RegexGenerator.Emitter.cs
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Replaces #89140. That PR changed how we emit custom IndexOf helpers, such that if we could fully enumerate the set and it contained a small enough number of characters, we would have the whole thing vectorized by first doing an ASCII-based search and then falling back to a probabilistic map search. But we then decided to move that approach down into SearchValues itself, via #89155. This means we can simplify TryFindNextPossibleStartingPosition in Regex to not track AsciiSet specially and instead just increase the number of characters we query the set for (from 5 to 128). That way, we'll use SearchValues rather than emitting our own helper up until a (semi-arbitrary) point where we deem it impossible or infeasible to enumerate all the chars that make up the set.