Python正则表达式将所有字符与字符集匹配

Question

I want to use match all the characters in a string with a set of characters and if any of the character in string is not matching, it should not match. I am using character set and I want all the charcters in string to match character set. But in case if any additional charater is present, it passes.

How can i fix it?

>>> re.search(r'[a-z]*','abcA')  
<_sre.SRE_Match object at 0x026DBBB8> ===> Should FAIL
>>> re.search(r'[a-z]*','abc')
<_sre.SRE_Match object at 0x026DBBF0>

Answer 1

Anchor the regex to restrict it. r'^[az]*$'

Answer 2

re.search(r'^[az]*$','abcA') This will do the job. ^ implies the start of a string, while $ implies the end of a string.