Regular expression for validating web site address

One of the questions I get asked again and again is how to validate a field value in an Acro Form with a custom validation script.

Adobe provided a lot of infrastructure to do that with just a simple script.

To start, we create a text field and bring up the properties dialog for the field.

Then we select the “Validate” tab to see the validation options: The default is that the field will not get validated.

The first argument in a tag function is an array with an extra property called to output the string result.

That means any character escapes, including Unicode code point escapes, should be returned in their raw form.

Attempting to use an undeclared variable in a template literal throws an error in both strict and non-strict modes. The dollar sign before the second substitution is output as-is because it’s not followed by an opening curly brace.

Template tags also have access to raw string information, which primarily means access to character escapes before they are transformed into their character equivalents.

The simplest way to work with raw string values is to use the built-in characters).

In that case, the previous value of the field is restored, and the user has to enter the data again.

This is not always desired (for more complicated data, it will probably be much easier to take a look, correct that one typo and continue with the rest of the form), so my preference is actually to mark the field so that the user knows which field needs to be corrected, and have the validation script not report a validation error back to the field: Using this method has implications on the form submission process: The form no longer can verify that the data is correct, so the submission function needs to do another round of validation to see if any of the required fields are not correct (one way to do that is to test all relevant fields to see if the text color is using the error color, or we can use global variables to store the validation state).

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If an expression evaluates to a number, as in the previous example, then the numeric value is passed in.

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