| Title | Test
                    Find
                    
                    Pattern Title | 
            
                | Expression | ^\$?([0-9]{1,3},([0-9]{3},)*[0-9]{3}|[0-9]+)(.[0-9][0-9])?$ | 
            
                | Description | Matches currency input with or without commas. | 
            
                | Matches | $3,023,123.34 | 9,876,453 | 123456.78 | 
            
                | Non-Matches | 4,33,234.34 | $1.234 | abc | 
            
                | Author | Rating:  Brian Orrell | 
            
                | Source |  | 
            
              | Your Rating |  | 
        
    
 
    
    
     
        
                
	                Title: Pattern Title
	                Name: Jim
	                Date: 3/13/2007 10:26:44 AM
	                Comment: 
Will not accept 5.5
                
                
            
                
	                Title: for US currency
	                Name: John
	                Date: 2/15/2007 3:10:34 PM
	                Comment: 
Follow what Rob suggested to get the US currency to work.  Once you add the \. it works as desired.
This regex-coach program allows you the enter a reg exp and test it on test input.  It has some issues, but it is free.
http://weitz.de/files/regex-coach.exe
                
                
            
                
	                Title: Software engineer
	                Name: Eric Eggers
	                Date: 11/16/2006 9:36:06 AM
	                Comment: 
I was able to match 0,30.  Might work for Europe, but...
                
                
            
                
	                Title: decimal chararcter matches anything
	                Name: Rob
	                Date: 1/2/2004 2:58:56 PM
	                Comment: 
just a nit but instead of .  use \.   so you match only the literal instead any one character; at least inside VB/ASP .NET
(subject to your 'local' currency format settings)