This is a C # extension that will mask the email address or a simple string to mask sensitive data.

Hide email address with * for GDPR reasons, for example.

If it is not an email address, the entire string will be masked as "******" or, if the first part before @ is less than four characters, the entire email will be masked and the result will be * @ *.
And for all other email addresses s*****e@dom***.com (first and last character for username and first 3 of domain plus suffix ".com", "with .br "and etc.)

For strings, will hide confidential data with * for GDPR reasons, for example. The new string will show the first 4 characters, such as "exam ***".