Unhandled Exception: System.ArgumentException: parsing "[]{2}" - Unterminated []
 set.
Parameter name: []{2}
   at System.Text.RegularExpressions.RegexParser.ScanRegex()
   at System.Text.RegularExpressions.RegexParser.Parse(String re, RegexOptions o
p)
   at System.Text.RegularExpressions.Regex..ctor(String pattern, RegexOptions op
tions)
   at System.Text.RegularExpressions.Regex.IsMatch(String input, String pattern)

   at Ch5Smp2.ParseLineIn() in c:\documents and settings\risc\my documents\visua
l studio projects\parser\class1.cs:line 46
   at Ch5Smp2.Main() in c:\documents and settings\risc\my documents\visual studi
o projects\parser\class1.cs:line 77