In Lime Forms you can use Custom Validation Rules (or Regular Expressions) to specify how a form field should be formatted. In other words; You can create rules to control in which way Lime Forms accept data for unique fields.
To create and manage your Custom Validation Rules in Lime Forms you navigate from the main menu to Settings > Custom Validation Rules
Manage Custom Validation Rules
Create new rule
Enter a description of your rule and write your pattern (Regular Expression) before trying it out and saving your new Custom Validation Rule.
When editing a Custom Validation Rule you will be presented with the rule itself and the option to edit it. A list of forms where the rule is used will also be presented here.