| Title | Test
                    Find
                    
                    Pattern Title | 
            
                | Expression | (?<=^|[\s ]+)[^\!\@\%\$\s ]*([\!\@\%\$][^\!\@\%\$\s ]*){2,}(?=[\s ]+|$) | 
            
                | Description | That pattern will filter for words that contain more than 1 instance of any of the following characters: ! $ % @.
May be useful in filtering for spam.  
Requires lookahead and lookbehind support in the underlying regex engine. | 
            
                | Matches | f%c$ | v!@gra | v@gr@ | 
            
                | Non-Matches | f%ck | viagra | 
            
                | Author | Rating:
                        
Not yet rated.
                    Darren Neimke | 
            
                | Source |  | 
            
              | Your Rating |  | 
        
    
 
    
    
     
        
                
	                Title: Redefining boundaries and lexing through a target string.
	                Name: Darren Neimke
	                Date: 3/8/2004 2:11:42 PM
	                Comment: 
I've written about some of the more interesting parts of this expression here:
http://blogs.regexadvice.com/dneimke/archive/2004/03/09/722.aspx