What is it ?
This customfield allows to check that typed value respects an Regular Expression. By example, you will be able to validate that the value follows :
- A Currency format,
- A Date format
- A Delay format,
- or any other wanted format
Add a new Customfield and select the RegExp Customfields
![](/download/attachments/17203248/image2017-11-18%2023%3A39%3A45.png?version=1&modificationDate=1511049097000&api=v2&effects=drop-shadow)
Go to Configure
![](/download/attachments/17203248/image2017-11-18%2023%3A41%3A23.png?version=1&modificationDate=1511049097000&api=v2&effects=drop-shadow)
Edit the Pattern of the Regular Expression
![](/download/attachments/17203248/image2017-11-18%2023%3A42%3A20.png?version=1&modificationDate=1511049097000&api=v2&effects=drop-shadow)
and specify the Regular Expression
![](/download/attachments/17203248/image2017-11-18%2023%3A52%3A38.png?version=1&modificationDate=1511049164000&api=v2&effects=drop-shadow)
How the validation is processed ?
When the value is entered, it is controlled against the Regular Expression on Client side, before the validation of the screen.
![](/download/attachments/17203248/image2017-11-18%2023%3A53%3A51.png?version=1&modificationDate=1511049237000&api=v2&effects=drop-shadow)
and validation it blocked ...
![](/download/attachments/17203248/image2017-11-18%2023%3A56%3A23.png?version=1&modificationDate=1511049389000&api=v2&effects=drop-shadow)