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avoid application freeze from regex.macthes using user entered expression

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :WPF

To my chargrin, I discovered using time limited thread  for regexMatch will not allow abort and still freeze the application.


However the freezing can be avoided despite bad user greedy expression if we precede the the matches inside the thread with


 if (!myRegex.IsMatch (...))


  // some sort state setting including message protected internal variable to indicate timeout



// then the actual matches statment

here is a sample inner class that can be used to do time limted matches

 private class MkMatchSvr


 private string sInput;

 Regex myRegex;

 protected internal string sOut;

 protected internal bool bOut;

 protected internal MatchCollection myMatch;


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