Here is the handy regular expressions, which can be used for Zip/Postal code validation on your web page.
1. France, Italy & Germany all have same format of zip/postal codes therefore the validation of these becomes very simple
For France/Italy/Germany Zip code validation Use below regular Expression, which is also same as zip code validation for US
For India Postal code validation Use below regular Expression to validate the zip/postal code in your form.
2. If you have a common form for France/Italy/Germany and India Address entry then use below Regular expression, which is going to allow France/Italy/Germany Zip code and India Postal Code in same field.
For France/Italy/Germany zip code & India Postal code validation both in same field use below regular Expression
In case you have not observed this, the regular expression for validating both Zip code and Postal code is a OR condition expression combining the two separate regular expressions for US Zip code and Canada Postal code with a pipe (|) separator.