TeX symbol move digits to front

[rqy2002]

TeX symbol moves all numbers behind it to the front.

And this is totally massed...
...1.tex changes to 1...[T].tex, .1.2.3.tex changes to 1.2.3.[T].tex, 123.tex -> 123[T].tex, 1.tex changes to 1[T].tex. ([T] stands for the symbol)

So why this happens? I think this is related to #80. I can't understand.

[rqy2002]

. and space seem similar in such situation.

[kyazdani42]

I think it's a duplicate of #46 and #80 :)