Different results using regex101 and the core function "pattern"

[khband]

When I use the pattern ^\d+.\d+.\d+$

The core function "pattern" seems to allow "2.0" while regex101 says that it shouldn't match with that. Do you have any idea why this is happening? Thanks

[P0lip]

Hey!
My apologies for such a delayed response.
Could you please share the rule? There might be something off with the ecapes.