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Using regular expressions for validation

Any valid regular expression could be used here. Some examples you can see below. 

Validations run on form submit

Since version 1.4.17 you can use the reserved word [unique] in order to check for field's value uniqueness. See examples below.

ValidationRegular expression
Value is empty^\s*$

Value NOT matching something 

(Allow everything, but 'something'. Useful when you would like to apply validation on dropdown fields)

Value is not empty^(?=\s*\S).*$
Value is alphanumeric^[a-zA-Z0-9]*$
Value contains only letters^[a-zA-Z]*$
Value length (1-20 chars)^.{1,20}$
Only numbers^[0-9,;]+$
Checks if the field's value is unique within the dataset[unique]
Checks if the field's value is unique within the dataset and ensures it's length (1-20 chars)^.{1,20}$[unique]
Allow only PDF files (files with "pdf" file extension).*?\.pdf
Starts with upper case letter followed by 9 numbers[A-Z]{1}\d{9}
Starts with 2 letters, upper or lower case and followed by 6 numbers[a-zA-Z]{2}\d{6}
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