fnmatch - single pattern to allow only text which have dots and digits

In GitHub I want to protect branches which have digits and dots. But if a branch has any letters, than it should not be protected

need fnmatch pattern so text with digits separated with dots will be matched

matched examples:

11.22
20.2
1.2.2.3.4

not matched examples:

abc_2.2

2.2_sss

1.9_AAA-1233