We know a zip code has 5 numeric digits, but we don’t know what those are.
If we only wanted to match the Beverly Hills zip code, we could put is another anchor. That means we only match if we have the beginning of the string, 5 numeric digits, and the end of the string with no characters before, after, or between.
This is achieved by grouping together validation functions in "modules", making it possible to load only those functions that's needed to validate a particular form.
This plugin is available through cdnjs, npm, bower and github.
If you want to allow any kind of letters (not only A-Z) you're looking for the letternumeric validator.
Validate qty of checkboxes in a group (same name) have been checked, using min, max or range.
The implemented rules are: Here you can read more about how to create your own modules.
To make the web browser check that a field is not empty, you will need to add a call to your validation function when the form is submitted.
In this post, you’ll learn some basic regular expressions syntax and how to use it to validate input from your user.
Read the setup guide if you want to know which configuration options that are available when setting up the validation.
Here you can read more about styling of the form and error dialogs.
Regular expressions define text patterns to find inside a string.