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Fix Regex.EnumerateMatches(span, pattern, options) always throwing - #647
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This was referenced Oct 12, 2026
This was referenced Oct 14, 2026
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Bug
Below net7.0 the static polyfill
Regex.EnumerateMatches(ReadOnlySpan<char>, string, RegexOptions)passedTimeSpan.MaxValueas the match timeout.Regexrejects that value, so every call threwArgumentOutOfRangeException.Fix
Pass
Regex.InfiniteMatchTimeout, the value that means "no timeout".Test
EnumerateMatchesStatic_WithOptionsinPolyfillTests_Regex.cscalls the overload withRegexOptions.IgnoreCaseand asserts the matches found. It threwArgumentOutOfRangeExceptionon net48 before the fix and passes on net48 and net6.0 (polyfill) and net10.0 (BCL) after it.EnumerateMatchesStatic_WithOptionsAndTimeoutadds the same coverage for the neighbouring timeout overload, which had none.