Using the Form Element, you can add a Text Field, where you need to set some validation rules to avoid getting wrong or incomplete information. These rules need to be defined by a regular expression (RegEx) that you must enter to validate a specific format in a given string of characters, such as IDs, date, zip code, credit card numbers, etc.

If you are not familiar with regular expressions, or you have no idea how to build one, do not worry, here is a guide that will help you to build a RegEx to validate your custom field.

After building your RegEx, it is very important that you test it before going live. This way, you make sure that the data you want to collect is correct. Here you have a free online RegEx tester: https://www.regextester.com/ 

Ready to use Recipes?

In the following table, you will find the regular expressions for ID validation of certain countries that we have selected. To use them in a Form Element, just copy and paste it into the validation rules field:

Country	ID	RegEx	RegEx Match
Argentina	DNI	^\d{1,2}\.?\d{3}\.?\d{3}$	00.000.000 0.000.000 00000000 0000000
	CUIT/CUIL	^\d{2}\-\d{8}\-\d{1}$	00-00000000-0
Brasil	RG	^\d{1,2}\.\d{3}\.\d{3}[-][0-9]{1,2}$	00.000.000-0 00.000.000-00 0.000.000-0 0.000.000-00
Chile	RUT	^\d{1,2}\.\d{3}\.\d{3}[-][0-9kK]{1}$	00.000.000-0 00.000.000-X 0.000.000-0 0.000.000-X
	Phone Number	^\+?569 ?[0-9]{8}$	+569 00000000
Colombia	CC	^\d{1,2}\.\d{3}\.\d{3}$	00.000.000 0.000.000
Ecuador	CI	^\d{9}\-\d{1}$	000000000-0
Egypt	بطاقة تحقيق شخصية Personal Verification Card	[A-Z,a-z]{2}[0-9]{7}	XX0000000 xx0000000
India	Aadhaar Card	^\d{4}\ \d{4}\ \d{4}$	0000 0000 0000
Mexico	IFE	[A-Z]{6}[0-9]{8}[A-Z]{1}[0-9]{3}	XXXXXX00000000X000
	Phone Number	^([+]?52[ ]1[ ])?[0-9]{2} [0-9]{4} [0-9]{4}$	+52 1 00 0000 0000 52 1 00 0000 0000 00 0000 0000
Spain	DNI	[0-9]{8}[A-Z]{1}	00000000X
USA	SSN	^\d{3}\-\d{2}-\d{4}$	000-00-0000
	Phone Number	^\+?1? ?[0-9]{3} [0-9]{3} ([0-9]{4}$	+1 000 000 0000 000 000 0000
Venezuela	CI	^\d{1,2}\.\d{3}\.\d{3}$	00.000.000

Another Useful RegEx