Entity Input Validation - Wizflow: Building the future of finance, today

Input validation ensures users provide data in the correct format before proceeding. Wizflow offers several validation types that can be applied to most entities.

When to use validation: Add validation rules when you need to enforce specific formats (like phone numbers or ID codes) or business rules (like age ranges or character limits).

Validation Types

Wizflow provides 8 built-in validation types to cover common validation scenarios.

Regex Pattern

Use case: Custom format validation (phone numbers, postal codes, IDs)
Commonly used with: Text, Text Area, Number

Range Validation (InRange)

Use case: Ensure numbers fall within min/max bounds
Commonly used with: Number, Amount, Age, Year

Length Validation (LengthInRange)

Use case: Enforce minimum or maximum character counts
Commonly used with: Text, Text Area

No Duplicate Value

Use case: Prevent repeated entries across a flow
Commonly used with: All input types

CPR Validation

Use case: Validate Danish CPR number format
Commonly used with: Text, Formatted Number

CPR Modulus 11

Use case: Strict CPR validation with modulus 11 checksum
Commonly used with: Text, Formatted Number

Choices Validation

Use case: Ensure valid selection in choice entities
Commonly used with: Choice, Multi-choice

Reject Choice

Use case: Block specific choices with custom actions
Commonly used with: Choice, Multi-choice

Regex Validation

Regex (Regular Expression) validation lets you define custom patterns that user input must match. This is the most flexible validation type for enforcing specific formats.

Configuration

Property	Description
`regex`	The regular expression pattern to match against
`message`	Error message shown when validation fails (supports translations)

Common Regex Examples

Copy and paste these patterns directly into your entity validation settings.

Phone Numbers
Postal Codes
Identification
Text Formats
Financial

Danish Phone Number (8 digits)

^\d{8}$

Error message: Please enter a valid 8-digit phone numberDanish Phone with Country Code

^(\+45)?\s?\d{2}\s?\d{2}\s?\d{2}\s?\d{2}$

Error message: Please enter a valid Danish phone number (e.g., +45 12 34 56 78)International Phone (E.164 format)

^\+[1-9]\d{6,14}$

Error message: Please enter a valid international phone number starting with +

Danish Postal Code (4 digits)

^\d{4}$

Error message: Please enter a valid 4-digit postal codeSwedish Postal Code (5 digits, optional space)

^\d{3}\s?\d{2}$

Error message: Please enter a valid Swedish postal code (e.g., 123 45)US ZIP Code (5 or 9 digits)

^\d{5}(-\d{4})?$

Error message: Please enter a valid ZIP code (e.g., 12345 or 12345-6789)

Danish License Plate

^[A-Z]{2}\s?\d{5}$

Error message: Please enter a valid license plate (e.g., AB 12345)IBAN (Generic)

^[A-Z]{2}\d{2}[A-Z0-9]{4,30}$

Error message: Please enter a valid IBAN numberDanish IBAN

^DK\d{16}$

Error message: Please enter a valid Danish IBAN (DK + 16 digits)CVR Number (8 digits)

^\d{8}$

Error message: Please enter a valid 8-digit CVR number

Letters Only - European (No Numbers)

^[a-zA-ZÀ-ÖØ-öø-ÿĀ-žḀ-ỿ\s]+$

Error message: Please enter letters only (no numbers or special characters)Supports: German (ä, ö, ü, ß), French (é, è, ê, ç), Spanish (ñ), Nordic (æ, ø, å), Polish (ł, ń, ś), Czech (č, ř, š), and more.Alphanumeric Only

^[a-zA-Z0-9]+$

Error message: Please enter letters and numbers onlyNo Special Characters - European

^[a-zA-Z0-9À-ÖØ-öø-ÿĀ-žḀ-ỿ\s\-]+$

Error message: Please avoid special charactersURL Format

^https?:\/\/(www\.)?[\w\-]+(\.[\w\-]+)+[\/\w\-\.]*\/?$

Error message: Please enter a valid URL (e.g., https://example.com)

Account Number (10 digits)

^\d{10}$

Error message: Please enter a valid 10-digit account numberDanish Bank Account (Reg + Account)

^\d{4}\s?\d{10}$

Error message: Please enter registration number (4 digits) and account number (10 digits)Credit Card (16 digits, spaces allowed)

^(\d{4}\s?){4}$

Error message: Please enter a valid 16-digit card number

Range Validation

Ensure numeric values fall within acceptable bounds.

Configuration

Property	Description
`min`	Minimum allowed value
`max`	Maximum allowed value

Examples

Age Restrictions

Adult Only (18+)

Min: 18
Max: 120

Working Age

Min: 18
Max: 67

Senior Discount Eligibility

Min: 65
Max: 120

Financial Limits

Loan Amount

Min: 10000
Max: 5000000

Monthly Premium

Min: 100
Max: 50000

Percentage (0-100)

Min: 0
Max: 100

Length Validation

Control the minimum and maximum number of characters in text inputs.

Configuration

Property	Description
`minLength`	Minimum number of characters required
`maxLength`	Maximum number of characters allowed

Examples

Use Case	Min Length	Max Length
Name field	2	100
Short description	10	200
Comment/feedback	20	1000
Reference code	6	6
Password	8	128

No Duplicate Value

Prevent users from entering values that have already been submitted in the same flow session.

Configuration

Property	Description
`key`	Unique identifier for the duplicate check group

Use Cases

Prevent duplicate email entries in multi-person forms
Ensure unique reference numbers
Avoid repeated selections in list-based inputs

CPR Validation

Validates that input matches the Danish CPR (Central Person Register) number format. This is a format-only validation that checks the structure of the CPR number.

Configuration

No additional configuration required. Simply add the CPR validation type to your entity.

What It Validates

10-digit format (DDMMYY-XXXX)
Valid date portion (day, month, year)
Correct structure with or without hyphen

Use Cases

Customer onboarding flows
Insurance applications
Banking KYC processes
Any flow requiring Danish personal identification

This validation checks format only. For stricter validation including the mathematical checksum, use CPR Modulus 11 instead.

CPR Modulus 11

A stricter CPR validation that includes the modulus 11 checksum verification. This ensures the CPR number is not only correctly formatted but also mathematically valid.

Configuration

No additional configuration required. Simply add the CPRModulus11 validation type to your entity.

How It Works

The modulus 11 algorithm multiplies each digit by a weight factor and checks if the sum is divisible by 11. This catches typos and invalid numbers that might pass basic format validation.

When to Use

Scenario	Recommended Validation
Quick format check	CPR
High-security flows (banking, insurance)	CPR Modulus 11
Government integrations	CPR Modulus 11
Customer self-service	CPR

Some valid CPR numbers issued after 2007 may not pass modulus 11 validation due to changes in the Danish CPR system. Consider your use case when choosing between CPR and CPR Modulus 11.

Choices Validation

Ensures that a valid selection has been made in choice-based entities. This validation is typically applied automatically to required choice fields.

Configuration

No additional configuration required. The validation ensures at least one valid option is selected.

Use Cases

Required single-choice questions
Multi-choice with minimum selection requirements
Dropdown menus that must have a selection

Reject Choice

Block specific choices from being accepted, optionally with custom error messages, warnings, or automated actions like redirects or tooltips.

Configuration

Property	Description
`choiceKey`	The key of the choice to reject
`choiceCount`	(Optional) Comparison operator and value for multi-choice scenarios
`message.error`	(Optional) Error message to display (supports translations)
`message.warning`	(Optional) Warning message to display (supports translations)
`action`	(Optional) Automated action to trigger

Available Actions

Reroute

Redirect the user to a different URL when they select the rejected choice.

Property	Description
`url`	Redirect URL (external: `https://site.com` or internal: `/page`). Use `{{LOCALE}}` placeholder for locale-aware URLs.

Video Modal Message

Property	Description
`titleText`	Modal title (supports translations)
`url`	Video URL to display

Tooltips

Show contextual tooltips to guide the user after selecting the rejected choice.

Property	Description
`containerID`	ID of the container element
`timeoutInMs`	How long tooltips remain visible
`tooltips`	Array of tooltip configurations with `referenceID` and `label`

Examples

Block Ineligible Users

choiceKey: "under_18"
message.error: "You must be 18 or older to proceed"

Redirect to Alternative Flow

choiceKey: "business_account"
action.type: "reroute"
action.url: "/business-onboarding"

Show Educational Video

choiceKey: "unsure"
action.type: "video-modal-message"
action.titleText: "Understanding Your Options"
action.url: "https://example.com/explainer-video.mp4"

Combining Validations

You can apply multiple validation rules to a single entity. Validations are checked in order, and the first failing rule displays its error message. Example: Secure Reference Code

Length Validation: Min 8, Max 12
Regex: ^[A-Z0-9]+$ - Uppercase letters and numbers only
No Duplicate Value: Key reference_codes

Best Practices

Clear Error Messages

Write specific, helpful messages that tell users exactly what’s expected. Avoid generic errors like “Invalid input.”

Test Your Patterns

Always test regex patterns with valid and invalid examples before publishing. Use online tools like regex101.com.

Consider Mobile Users

Some patterns work better with specific keyboard types. Consider using inputmode attributes for phone numbers and numeric codes.

Localize Messages

Error messages support translations. Provide translated versions for all languages your flow supports.

Regex Quick Reference

Pattern	Meaning
`^`	Start of string
`$`	End of string
`\d`	Any digit (0-9)
`\D`	Any non-digit
`\w`	Word character (a-z, A-Z, 0-9, _)
`\s`	Whitespace (space, tab, newline)
`.`	Any character except newline
`+`	One or more of the previous
`*`	Zero or more of the previous
`?`	Zero or one of the previous (optional)
`{n}`	Exactly n occurrences
`{n,m}`	Between n and m occurrences
`[abc]`	Any character in the brackets
`[^abc]`	Any character NOT in the brackets

Flow Builder

Entities & Data Collection

Logic & Automation

Testing Tools

​Validation Types

Regex Pattern

Range Validation (InRange)

Length Validation (LengthInRange)

No Duplicate Value

CPR Validation

CPR Modulus 11

Choices Validation

Reject Choice

​Regex Validation

​Configuration

​Common Regex Examples

​Range Validation

​Configuration

​Examples

​Length Validation

​Configuration

​Examples

​No Duplicate Value

​Configuration

​Use Cases

​CPR Validation

​Configuration

​What It Validates

​Use Cases

​CPR Modulus 11

​Configuration

​How It Works

​When to Use

​Choices Validation

​Configuration

​Use Cases

​Reject Choice

​Configuration

​Available Actions

​Examples

​Combining Validations

​Best Practices

Clear Error Messages

Test Your Patterns

Consider Mobile Users

Localize Messages

​Regex Quick Reference

​Related Pages

Validation Types

Regex Validation

Configuration

Common Regex Examples

Range Validation

Configuration

Examples

Length Validation

Configuration

Examples

No Duplicate Value

Configuration

Use Cases

CPR Validation

Configuration

What It Validates

Use Cases

CPR Modulus 11

Configuration

How It Works

When to Use

Choices Validation

Configuration

Use Cases

Reject Choice

Configuration

Available Actions

Examples

Combining Validations

Best Practices

Regex Quick Reference

Related Pages