- Go to Agents > Data Loss Prevention > Data Identifiers.
 - Click the Expression tab.
 - 
                Click Add. 
 
                    
A new screen displays.
 - 
                Type a name for the expression. The name must not exceed
                        100 bytes in length and cannot contain the
                    following characters:
- 
                        
> < * ^ | & ? \ /
 
 - 
                        
 - Type a description that does not exceed 256 bytes in length.
 - 
                Type the displayed data. 
 
                    
For example, if you are creating an expression for ID numbers, type a sample ID number. This data is used for reference purposes only and will not appear elsewhere in the product.
 - 
                Choose one of the following criteria and configure
                    additional settings for the chosen criteria (see Criteria for Customized Expressions):
- 
                        
None
 - 
                        
Specific characters
 - 
                        
Suffix
 - 
                        
Single-character separator
 
 - 
                        
 - 
                Test the expression against an actual data. 
 
                    
For example, if the expression is for a national ID, type a valid ID number in the Test data text box, click Test, and then check the result.
 - 
                Click Save if you are satisfied
                    with the result.
                 
                    Note:
Save the settings only if the testing was successful. An expression that cannot detect any data wastes system resources and may impact performance.
 - A message appears, reminding you to deploy the settings to agents. Click Close.
 - Back in the DLP Data Identifiers screen, click Apply to All Agents.
 
Parent topic: Customized Expressions
		