使用正则表达式从字符串中提取数字

Question

我有以下字符串:

fname="VDSKBLAG00120C02 (10).gif"

如何10从字符串中提取值fname(使用re)？

Answer 1

一个更简单的正则表达式是\((\d+)\):

regex = re.compile(r'\((\d+)\)')
value = int(re.search(regex, fname).group(1))

Answer 2

regex = re.compile(r"(?<=\()\d+(?=\))")
value = int(re.search(regex, fname).group(0))

说明:

(?<=\() # Assert that the previous character is a (
\d+     # Match one or more digits
(?=\))  # Assert that the next character is a )