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15 - Regex Validation

Regex (or regular expression) is a way to check if the user's input is correct. Regex is a language, and you can use PHP Regex with our plugin (PCRE, click here for more details).
For example, if you want to restrict your user to type only letters in some input fields:

  • Click on "PHP Regex"
  • Click on "New Regex (PHP)"
  • Add a "Name *" for your regex, for example, "Only letters" and write a Regex in the "Regex (PHP)" field, for example: "/^[a-zA-Z]$/" and click on "Save"
  • Go to the field on which you want to apply the regex rule, it must be a "Text" field
  • You can write the regex rule directly in the "Validation Regex Rule" field or load it from the library by clicking on the cloud icon.
  • Write an error message in the "Regex Error Message" field which you want to show in case the regex rule conditions are not met.

As a result:

  • If you try to put a number in your website product, you'll get an error message.
  • If you try to put only letters, no errors will be shown and the product can be added to the cart successfully after the calculation of price on the backend.


F.A.Q (constantly updated)

How many fields can I create in PRO version?

PRO version allows you to create unlimited fields.

How to properly install the plugin?

Our Price Calculator PRO plugins are about 32MB size (for WordPress) and 13MB (for Joomla). They need to be installed throught the CMS admin panel in order to create automatically also tables on batabase.

Are our plugins compatibles with PHP7?

Yes, the plugins are compatible with PHP7 version.

What happens to the pro features after subscription expires?

Nothing happens to pro features in your website over subscription time.
After subscription expires, you’ll not be able to get further updates (with new features and bugfix) and forum support until you renew it.

How can I create a new template for my product page?

You can create a new template by following the example code here

How can I customize the default template for my product page?

You can customize the default template by following the example code here

How can I create fields?

You can create fields by following the instructions here

How can I create a mathematical formula for the calculator?

You can create the formula by following the instructions here

How can I create a calculator from excel?

You can create the calculator by following the instructions here

How can I customize the CSS style of the fields?

You can customize the CSS style by following the instructions here

How can I translate labels and values of fields?

You can translate them by following the instruction at: here
If there is no example, you can create the file you need.

Example (WordPress):


return array( 
'height' => 'Height',


return array(
'height' => 'Altezza',

The same method works for items of a dropdown. So if you create a new dropdown field, you can translate every item of the dropdown.

How can I remove the "powered by wooprice calculator" promotion in the product page?

You can't remove it in the free version. You can remove the "powered by wooprice calculator" after buying a subscription of Our Price Calculator PRO.

How can I create conditional formulas?

You can do it with Excel Sheet. With Excel, you can write conditional formulas "=IF() " and assign inputs fields and output price to your products.
Take a look at our PRO here

Can this plugin calculate any excel formulas?

Check if WPC does work for you directly in our live demo:

Why do I see a blank page or an empty area?

If you are working with our plugin and you see a blank page or an empty area of the screen then it means there could be some errors but WordPress doesn't let see you them.

To show those errors you need to:

  1. Edit via FTP the file "wp-config.php", change define( 'WP_DEBUG', false ); to define( 'WP_DEBUG', true ); For more information click here
  2. Go again where you saw the blank page or the empty area. Now you should be able to see the errors.
  3. Maybe you can solve the problem on your own because most times it's a PHP extension missing on your server, a permission/ownership file problem, etc). But if you don't understand the error make a screenshot and open a new support request in the forum and we'll be happy to help you.

Which kind of spreadsheet files I can upload to deploy a clculator?

Our plugins allows to upload Excel, LibreOffice, OpenOffice spreadsheet files to deploy calculators.


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