Help in Regular Expression

Hi Forum Members,

I am trying to write code using regular expression. Please tell me where I am going wrong

string='d75'
pattern'[a-zA-Z]+[0-9]*'

re.search(pattern,string) doesn't give me positive result.
I cannot get why this is happening. As + means precedence and * can be any number of occurrence.
Any help shall be highly appreciated.
Many Thanks in advance.

Regards,
Metallic