include::../description.adoc[]

== Sensitive Code Example

[source,csharp]
----
public void RegexPattern(string input)
{
    var emailPattern = new Regex(".+@.+", RegexOptions.None);
    var isNumber = Regex.IsMatch(input, "[0-9]+");
    var isLetterA = Regex.IsMatch(input, "(a+)+");
}
----

== Compliant Solution

[source,csharp]
----
public void RegexPattern(string input)
{
    var emailPattern = new Regex(".+@.+", RegexOptions.None, TimeSpan.FromMilliseconds(100));
    var isNumber = Regex.IsMatch(input, "[0-9]+", RegexOptions.None, TimeSpan.FromMilliseconds(100));
    var isLetterA = Regex.IsMatch(input, "(a+)+", RegexOptions.NonBacktracking); // .Net 7 and above
    AppDomain.CurrentDomain.SetData("REGEX_DEFAULT_MATCH_TIMEOUT", TimeSpan.FromMilliseconds(100)); // process-wide setting
}
----

include::../see.adoc[]

include::../rspecator.adoc[]