Problem with Regex Find/Replace

I get the following exception when doing a regex find+replace with the following:

Running a find replace with the following....
Find What \n{Set@LastTime.+}\n

-----------------------------

Exceptions

Top Level Exception
Type: ActiproSoftware.SyntaxEditor.InvalidRegexPatternException
Message: An invalid character 'S' was found in a range specification.
Source: ActiproSoftware.SyntaxEditor
Stack Trace: at _37._1(_35 )
at _37._1(_35 , _35 )
at _37._1(Int32 , Boolean )
at _37._1(Int32 , Boolean )
at _37._1(String , Boolean , Boolean , LexicalMacroCollection ,
CaseSensitivity )
at ActiproSoftware.SyntaxEditor.FindReplaceOptions._1()

Any ideas on why this might be happening?

Thanks,

Ashton