Global Regex

Global Regex Module enables the site builders or developers to add regular expression based validations globally on custom text fields for contents or text fields created with drupal form api.
With the help of this module regular expressions can be added and changed globally.

Difference with FAPI Validation
https://www.drupal.org/project/fapi_validation provides api for applying various types of validations on fields while Global Regex provides uniformity for reular expressions which needs to be applied on multiple fields without any code.