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Fix SYSLIB1045: Convert Regex to GeneratedRegex source generators #46708

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Fix SYSLIB1045: Convert Regex to GeneratedRegex source generators #46708

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3c897e1
Fix SYSLIB1045: Convert Regex to GeneratedRegex source generators
crutkas Apr 1, 2026
4829b51
Fix SA1500 brace violation and misplaced using in WebSearch/Main.cs
Copilot Apr 1, 2026
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7 changes: 5 additions & 2 deletions src/dsc/PowerToys.Settings.DSC.Schema.Generator/Common.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,13 +12,16 @@

namespace PowerToys.Settings.DSC.Schema;

internal sealed class Common
internal sealed partial class Common
{
private static string[] TypeParts(string name)
{
return Regex.Split(name.ToLower(CultureInfo.CurrentCulture), @"(?<!^)(?=[A-Z])|\.");
return CamelCaseSplitRegex().Split(name.ToLower(CultureInfo.CurrentCulture));
}

[GeneratedRegex(@"(?<!^)(?=[A-Z])|\.")]
private static partial Regex CamelCaseSplitRegex();

internal static bool InferIsBool(Type propertyInfo)
{
return TypeParts(propertyInfo.Name).Any(word => word.Equals("Bool", StringComparison.OrdinalIgnoreCase) || word.Equals("Boolean", StringComparison.OrdinalIgnoreCase));
Expand Down
49 changes: 30 additions & 19 deletions src/modules/AdvancedPaste/AdvancedPaste/Helpers/JsonHelper.cs
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Expand Up @@ -16,23 +16,34 @@

namespace AdvancedPaste.Helpers
{
internal static class JsonHelper
internal static partial class JsonHelper
{
// Ini parts regex
private static readonly Regex IniSectionNameRegex = new Regex(@"^\[(.+)\]");
private static readonly Regex IniValueLineRegex = new Regex(@"(.+?)\s*=\s*(.*)");

// List of supported CSV delimiters and Regex to detect separator property
// List of supported CSV delimiters
private static readonly char[] CsvDelimArry = [',', ';', '\t'];
private static readonly Regex CsvSepIdentifierRegex = new Regex(@"^sep=(.)$", RegexOptions.IgnoreCase);

// CSV: Split on every occurrence of the delimiter except if it is enclosed by " and ignore two " as escaped "
private static readonly string CsvDelimSepRegexStr = @"(?=(?:[^""]*""[^""]*"")*(?![^""]*""))";

// Ini parts regex
[GeneratedRegex(@"^\[(.+)\]")]
private static partial Regex IniSectionNameRegex();

[GeneratedRegex(@"(.+?)\s*=\s*(.*)")]
private static partial Regex IniValueLineRegex();

// Regex to detect separator property
[GeneratedRegex(@"^sep=(.)$", RegexOptions.IgnoreCase)]
private static partial Regex CsvSepIdentifierRegex();

// CSV: Regex to remove/replace quotation marks
private static readonly Regex CsvRemoveSingleQuotationMarksRegex = new Regex(@"^""(?!"")|(?<!"")""$|^""""$");
private static readonly Regex CsvRemoveStartAndEndQuotationMarksRegex = new Regex(@"^""(?=(""{2})+)|(?<=(""{2})+)""$");
private static readonly Regex CsvReplaceDoubleQuotationMarksRegex = new Regex(@"""{2}");
[GeneratedRegex(@"^""(?!"")|(?<!"")""$|^""""$")]
private static partial Regex CsvRemoveSingleQuotationMarksRegex();

[GeneratedRegex(@"^""(?=(""{2})+)|(?<=(""{2})+)""$")]
private static partial Regex CsvRemoveStartAndEndQuotationMarksRegex();

[GeneratedRegex(@"""{2}")]
private static partial Regex CsvReplaceDoubleQuotationMarksRegex();

private static bool IsJson(string text)
{
Expand Down Expand Up @@ -98,14 +109,14 @@ internal static async Task<string> ToJsonFromXmlOrCsvAsync(DataPackageView clipb
// Validate content as ini
// (First line is a section name and second line is a section name or a key-value-pair.
// For the second line we check both, in case the first ini section is empty.)
if (lines.Length >= 2 && IniSectionNameRegex.IsMatch(lines[0]) &&
(IniSectionNameRegex.IsMatch(lines[1]) || IniValueLineRegex.IsMatch(lines[1])))
if (lines.Length >= 2 && IniSectionNameRegex().IsMatch(lines[0]) &&
(IniSectionNameRegex().IsMatch(lines[1]) || IniValueLineRegex().IsMatch(lines[1])))
{
// Parse and convert Ini
foreach (string line in lines)
{
Match lineSectionNameCheck = IniSectionNameRegex.Match(line);
Match lineKeyValuePairCheck = IniValueLineRegex.Match(line);
Match lineSectionNameCheck = IniSectionNameRegex().Match(line);
Match lineKeyValuePairCheck = IniValueLineRegex().Match(line);

if (lineSectionNameCheck.Success)
{
Expand Down Expand Up @@ -163,7 +174,7 @@ internal static async Task<string> ToJsonFromXmlOrCsvAsync(DataPackageView clipb
foreach (var line in lines)
{
// If line is separator property line, then skip it
if (CsvSepIdentifierRegex.IsMatch(line))
if (CsvSepIdentifierRegex().IsMatch(line))
{
continue;
}
Expand Down Expand Up @@ -222,7 +233,7 @@ private static void GetCsvDelimiter(in string[] csvLines, out char delimiter, ou
if (csvLines.Length > 1)
{
// Try to select the delimiter based on the separator property.
Match matchChar = CsvSepIdentifierRegex.Match(csvLines[0]);
Match matchChar = CsvSepIdentifierRegex().Match(csvLines[0]);
if (matchChar.Success)
{
// We can do matchChar[0] as the match only returns one character.
Expand Down Expand Up @@ -273,15 +284,15 @@ private static void GetCsvDelimiter(in string[] csvLines, out char delimiter, ou
private static string ReplaceQuotationMarksInCsvData(string str)
{
// Remove first and last single quotation mark (enclosing quotation marks) and remove quotation marks of an empty data set ("").
str = CsvRemoveSingleQuotationMarksRegex.Replace(str, string.Empty);
str = CsvRemoveSingleQuotationMarksRegex().Replace(str, string.Empty);

// Remove first quotation mark if followed by pairs of quotation marks
// and remove last quotation mark if precede by pairs of quotation marks.
// (Removes enclosing quotation marks around the cell data for data like /"""abc"""/.)
str = CsvRemoveStartAndEndQuotationMarksRegex.Replace(str, string.Empty);
str = CsvRemoveStartAndEndQuotationMarksRegex().Replace(str, string.Empty);

// Replace pairs of two quotation marks with a single quotation mark. (Escaped quotation marks.)
str = CsvReplaceDoubleQuotationMarksRegex.Replace(str, "\"");
str = CsvReplaceDoubleQuotationMarksRegex().Replace(str, "\"");

return str;
}
Expand Down
17 changes: 13 additions & 4 deletions src/modules/AdvancedPaste/AdvancedPaste/Helpers/MarkdownHelper.cs
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Expand Up @@ -13,8 +13,17 @@

namespace AdvancedPaste.Helpers
{
internal static class MarkdownHelper
internal static partial class MarkdownHelper
{
[GeneratedRegex(@"<!--StartFragment-->|<!--EndFragment-->")]
private static partial Regex FragmentCommentsRegex();

[GeneratedRegex(@"\s{2,}")]
private static partial Regex ExcessiveWhitespaceRegex();

[GeneratedRegex(@"[\r\n]+")]
private static partial Regex LineBreaksRegex();

public static async Task<string> ToMarkdownAsync(DataPackageView clipboardData)
{
Logger.LogTrace();
Expand All @@ -31,7 +40,7 @@ private static string CleanHtml(string html)
Logger.LogTrace();

// Remove the "StartFragment" and "EndFragment" comments
html = Regex.Replace(html, @"<!--StartFragment-->|<!--EndFragment-->", string.Empty);
html = FragmentCommentsRegex().Replace(html, string.Empty);

HtmlDocument document = new HtmlDocument();
document.LoadHtml(html);
Expand Down Expand Up @@ -95,8 +104,8 @@ private static void CleanUpWhitespace(HtmlNode node)
// Clean up line breaks and excessive whitespace
if (node.NodeType == HtmlNodeType.Text)
{
node.InnerHtml = Regex.Replace(node.InnerHtml, @"\s{2,}", " ");
node.InnerHtml = Regex.Replace(node.InnerHtml, @"[\r\n]+", string.Empty);
node.InnerHtml = ExcessiveWhitespaceRegex().Replace(node.InnerHtml, " ");
node.InnerHtml = LineBreaksRegex().Replace(node.InnerHtml, string.Empty);
}
else
{
Expand Down
14 changes: 9 additions & 5 deletions src/modules/Hosts/HostsUILib/Helpers/ValidationHelper.cs
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Expand Up @@ -7,7 +7,7 @@

namespace HostsUILib.Helpers
{
public static class ValidationHelper
public static partial class ValidationHelper
{
/// <summary>
/// Determines whether the address is a valid IPv4
Expand All @@ -19,8 +19,7 @@ public static bool ValidIPv4(string address)
return false;
}

var regex = new Regex("^(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");
return regex.IsMatch(address);
return IPv4Regex().IsMatch(address);
}

/// <summary>
Expand All @@ -33,8 +32,7 @@ public static bool ValidIPv6(string address)
return false;
}

var regex = new Regex("^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$");
return regex.IsMatch(address);
return IPv6Regex().IsMatch(address);
}

/// <summary>
Expand Down Expand Up @@ -64,5 +62,11 @@ public static bool ValidHosts(string hosts, bool validateHostsLength)

return true;
}

[GeneratedRegex("^(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$")]
private static partial Regex IPv4Regex();

[GeneratedRegex("^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$")]
private static partial Regex IPv6Regex();
}
}
12 changes: 9 additions & 3 deletions src/modules/MeasureTool/Tests/ScreenRuler.UITests/TestHelper.cs
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Expand Up @@ -12,7 +12,7 @@

namespace ScreenRuler.UITests
{
public static class TestHelper
public static partial class TestHelper
{
private static readonly string[] ShortcutSeparators = { " + ", "+", " " };

Expand Down Expand Up @@ -330,8 +330,8 @@ public static bool ValidateSpacingClipboardContent(string clipboardText, string

return spacingType switch
{
"Spacing" => Regex.IsMatch(clipboardText, @"\d+\s*[�x×]\s*\d+"),
"Horizontal Spacing" or "Vertical Spacing" => Regex.IsMatch(clipboardText, @"^\d+$"),
"Spacing" => SpacingPatternRegex().IsMatch(clipboardText),
"Horizontal Spacing" or "Vertical Spacing" => DigitsOnlyRegex().IsMatch(clipboardText),
_ => false,
};
}
Expand Down Expand Up @@ -462,5 +462,11 @@ private static void ValidateClipboardResults(string testName)
containsValidPattern,
$"{testName}: Clipboard should contain valid spacing measurement, but contained: '{clipboardText}'");
}

[GeneratedRegex(@"\d+\s*[�x×]\s*\d+")]
private static partial Regex SpacingPatternRegex();

[GeneratedRegex(@"^\d+$")]
private static partial Regex DigitsOnlyRegex();
}
}
5 changes: 4 additions & 1 deletion src/modules/MouseWithoutBorders/App/Form/Settings/SetupPage2a.cs
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Expand Up @@ -89,7 +89,7 @@ private void LinkButtonClick(object sender, System.EventArgs e)
{
if (GetSecureKey() != SecurityCodeField.Text)
{
Encryption.MyKey = Regex.Replace(SecurityCodeField.Text, @"\s+", string.Empty);
Encryption.MyKey = WhitespaceRegex().Replace(SecurityCodeField.Text, string.Empty);
SecurityCode = Encryption.MyKey;
}

Expand All @@ -113,5 +113,8 @@ private void CollapseHelpButtonClick(object sender, System.EventArgs e)
HelpLabel.Hide();
CollapseHelpButton.Hide();
}

[GeneratedRegex(@"\s+")]
private static partial Regex WhitespaceRegex();
}
}
5 changes: 4 additions & 1 deletion src/modules/MouseWithoutBorders/App/Form/frmMatrix.cs
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Expand Up @@ -72,7 +72,7 @@ private void ButtonOK_Click(object sender, EventArgs e)
{
buttonOK.Enabled = false;

if (!UpdateKey(Regex.Replace(textBoxEnc.Text, @"\s+", string.Empty)))
if (!UpdateKey(WhitespaceRegex().Replace(textBoxEnc.Text, string.Empty)))
{
buttonOK.Enabled = true;
return;
Expand Down Expand Up @@ -1233,5 +1233,8 @@ private void PaintMyLogo()
g2.Dispose();
}
#endif

[GeneratedRegex(@"\s+")]
private static partial Regex WhitespaceRegex();
}
}
9 changes: 5 additions & 4 deletions src/modules/PowerOCR/PowerOCR/Helpers/OcrExtensions.cs
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Expand Up @@ -20,7 +20,7 @@

namespace PowerOCR.Helpers
{
internal static class OcrExtensions
internal static partial class OcrExtensions
{
public static void GetTextFromOcrLine(this OcrLine ocrLine, bool isSpaceJoiningOCRLang, StringBuilder text)
{
Expand All @@ -40,13 +40,11 @@ public static void GetTextFromOcrLine(this OcrLine ocrLine, bool isSpaceJoiningO
bool isFirstWord = true;
bool isPrevWordSpaceJoining = false;

Regex regexSpaceJoiningWord = new(@"(^[\p{L}-[\p{Lo}]]|\p{Nd}$)|.{2,}");

foreach (OcrWord ocrWord in ocrLine.Words)
{
string wordString = ocrWord.Text;

bool isThisWordSpaceJoining = regexSpaceJoiningWord.IsMatch(wordString);
bool isThisWordSpaceJoining = SpaceJoiningWordRegex().IsMatch(wordString);

if (isFirstWord || (!isThisWordSpaceJoining && !isPrevWordSpaceJoining))
{
Expand Down Expand Up @@ -104,5 +102,8 @@ internal static async Task<OcrResult> GetOcrResultFromImageAsync(Bitmap bmp, Lan
OcrEngine ocrEngine = OcrEngine.TryCreateFromLanguage(language);
return await ocrEngine.RecognizeAsync(softwareBmp);
}

[GeneratedRegex(@"(^[\p{L}-[\p{Lo}]]|\p{Nd}$)|.{2,}")]
private static partial Regex SpaceJoiningWordRegex();
}
}
8 changes: 5 additions & 3 deletions src/modules/PowerOCR/PowerOCR/Helpers/StringHelpers.cs
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Expand Up @@ -8,7 +8,7 @@

namespace PowerOCR.Helpers;

internal static class StringHelpers
internal static partial class StringHelpers
{
public static string MakeStringSingleLine(this string textToEdit)
{
Expand All @@ -25,8 +25,7 @@ public static string MakeStringSingleLine(this string textToEdit)
workingString.Replace('\n', ' ');
workingString.Replace('\r', ' ');

Regex regex = new("[ ]{2,}");
string temp = regex.Replace(workingString.ToString(), " ");
string temp = MultipleSpacesRegex().Replace(workingString.ToString(), " ");
workingString.Clear();
workingString.Append(temp);
if (workingString[0] == ' ')
Expand All @@ -41,4 +40,7 @@ public static string MakeStringSingleLine(this string textToEdit)

return workingString.ToString();
}

[GeneratedRegex("[ ]{2,}")]
private static partial Regex MultipleSpacesRegex();
}
6 changes: 4 additions & 2 deletions src/modules/Workspaces/WorkspacesCsharpLibrary/Models/BaseApplication.cs
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Expand Up @@ -192,8 +192,7 @@ public bool IsPackagedApp
else
{
string appPath = AppPath.Replace("C:\\Program Files\\WindowsApps\\", string.Empty);
Regex packagedAppPathRegex = new Regex(@"(?<APPID>[^_]*)_\d+.\d+.\d+.\d+_(:?x64|arm64)__(?<PublisherID>[^\\]*)", RegexOptions.ExplicitCapture | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
Match match = packagedAppPathRegex.Match(appPath);
Match match = PackagedAppPathRegex().Match(appPath);
_isPackagedApp = match.Success;
if (match.Success)
{
Expand All @@ -213,5 +212,8 @@ public void Dispose()
{
GC.SuppressFinalize(this);
}

[GeneratedRegex(@"(?<APPID>[^_]*)_\d+.\d+.\d+.\d+_(:?x64|arm64)__(?<PublisherID>[^\\]*)", RegexOptions.ExplicitCapture | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase)]
private static partial Regex PackagedAppPathRegex();
}
}
19 changes: 10 additions & 9 deletions src/modules/cmdpal/Microsoft.CmdPal.Common/Services/Sanitizer/FilenameMaskRuleProvider.cs
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Expand Up @@ -8,7 +8,7 @@

namespace Microsoft.CmdPal.Common.Services.Sanitizer;

internal sealed class FilenameMaskRuleProvider : ISanitizationRuleProvider
internal sealed partial class FilenameMaskRuleProvider : ISanitizationRuleProvider
{
private static readonly FrozenSet<string> CommonFileStemExclusions = new[]
{
Expand All @@ -30,14 +30,7 @@ internal sealed class FilenameMaskRuleProvider : ISanitizationRuleProvider

public IEnumerable<SanitizationRule> GetRules()
{
const string pattern = """
(?<full>
(?: [A-Za-z]: )? (?: [\\/][^\\/:*?""<>|\s]+ )+ # drive-rooted or UNC-like
| [^\\/:*?""<>|\s]+ (?: [\\/][^\\/:*?""<>|\s]+ )+ # relative with at least one sep
)
""";

var rx = new Regex(pattern, SanitizerDefaults.DefaultOptions | RegexOptions.IgnorePatternWhitespace, TimeSpan.FromMilliseconds(SanitizerDefaults.DefaultMatchTimeoutMs));
var rx = FilePathRegex();
yield return new SanitizationRule(rx, MatchEvaluator, "Mask filename in any path");
yield break;

Expand Down Expand Up @@ -138,4 +131,12 @@ private static bool IsVersionSegment(string file)

return hasDot;
}

[GeneratedRegex("""
(?<full>
(?: [A-Za-z]: )? (?: [\\/][^\\/:*?""<>|\s]+ )+ # drive-rooted or UNC-like
| [^\\/:*?""<>|\s]+ (?: [\\/][^\\/:*?""<>|\s]+ )+ # relative with at least one sep
)
""", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.IgnorePatternWhitespace)]
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Copilot AI Apr 7, 2026

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FilePathRegex no longer applies the sanitizer regex match timeout (previously TimeSpan.FromMilliseconds(SanitizerDefaults.DefaultMatchTimeoutMs)). Since this rule runs on potentially untrusted/large input, dropping the timeout can reintroduce Regex DoS risks and change operational behavior. Please include SanitizerDefaults.DefaultMatchTimeoutMs in the [GeneratedRegex] attribute (and consider using SanitizerDefaults.DefaultOptions | RegexOptions.IgnorePatternWhitespace to stay consistent with the other sanitizer rule providers).

Suggested change
""", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.IgnorePatternWhitespace)]
""", SanitizerDefaults.DefaultOptions | RegexOptions.IgnorePatternWhitespace, SanitizerDefaults.DefaultMatchTimeoutMs)]

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private static partial Regex FilePathRegex();
}
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