Validators

Alphanumeric

The validator checks whether the field contains an alphanumeric string only. "Alphanumeric" defines a combination of alphabetic and numeric characters. No special characters can be entered, only characters from [A-Z] and [0-9]. The settings of the validator are as follows:

• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Text"
• "Textarea"
• "Password"
• "Advanced password"

String length

The validator uses the minimum and maximum values to check how many characters can be entered. The settings of the validator are as follows:

• Minimum: How many characters the field must contain as a minimum.
• Maximum: How many characters the field may contain as a maximum.
• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Text"
• "Textarea"
• "Password"
• "Advanced password"

Email

The validator checks whether the entered value is a valid email address. The default allows international characters and multiple occurrences of the @ sign. The settings of the validator are as follows:

• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Text"
• "Email address" (validator is automatically active)
• "Password"
• "Advanced password"

Integer number

The validator checks whether the entered value is a valid integer. No numbers with commas can be entered. The settings of the validator are as follows:

• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Text"
• "Textarea"
• "Password"
• "Advanced password"

Floating-point number

The validator checks whether the entered value is a valid floating-point number. Only numbers with a comma can be entered. The settings of the validator are as follows:

• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Text"
• "Textarea"
• "Password"
• "Advanced password"

Number

The validator checks whether the entered value is a valid number. Only numbers without a comma can be entered. The settings of the validator are as follows:

• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Number" (validator is automatically active)

Number range

The validator checks if the entered value is a number within the specified number range. The settings of the validator are as follows:

• Minimum: The minimum value to accept.
• Maximum: The maximum value to be accepted.
• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Text"
• "Textarea"
• "Password"
• "Advanced password"
• "Number"

Regular expression

The validator checks whether the entered value matches the specified regular expression. The settings of the validator are as follows:

• Regular expression: The regular expression to use for validation.
• Custom error message: Custom error message that will be shown if the validation fails.

Imagine the following example. You want the user to specify a domain name. The value entered should contain only the domain, for example, "docs.typo3.org" instead of "https://docs.typo3.org". The regular expression for this use case would be /^[a-z]+.[a-z]+.[a-z]$/.

The validator is available for the following form elements:

• "Text"
• "Textarea"
• "Password"
• "Advanced password"
• "Telephone number"
• "URL"

Date range

The validator checks whether the entered value is within the specified date range. The range can be defined by specifying a start and/ or end date. The settings of the validator are as follows:

• Start date: Select the beginning of the date range (input: YYYY-MM-DD).
• End date: Select the end of the date range (input: YYYY-MM-DD).
• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Date"

Number of submitted values

The validator checks whether the entered value, which is defined in a minimum and a maximum, contains the specified number of elements. The settings of the validator are as follows:

• Minimum: The minimum number of values submitted.
• Maximum: The maximum number of submitted values.
• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Multi checkbox"
• "Multi select"

File size

The validator checks a file resource for its file size. The settings of the validator are as follows:

• Minimum: The minimum file size that is accepted (default: 0B).
• Maximum: The maximum file size that will be accepted (default: 10M).

Use the format B | K | M | G (byte | kilobyte | megabyte | gigabyte) when entering file sizes. For example: 10M means 10 megabytes. Please note that the maximum file size also depends on the settings of your server environment.

The validator is available for the following form elements:

• "File upload"
• "Image upload"

Date/ Time

The validator checks if the entered value is a valid date and/ or time. The settings of the validator are as follows:

• Custom error message: Custom error message that will be shown if the validation fails.

The validator is available for the following form elements:

• "Date picker (jQuery)"