Underscores in isFQDN #33
Description
isFQDN doesn't allow underscores even if the allowUnderscores is set to true:.
Example:
isFQDN("test_example", requireTld: false, allowUnderscores: true)
Result: false
isFQDN("testexample_com", requireTld: false, allowUnderscores: true)
Result: false