python - 查找字符串中字符的索引

Question

dave = [m.start() for m in re.finditer('*', "2345234*265354*26342567*356")]
print(dave)

每当我运行这段代码时，它都会给我这个巨大的错误。

Traceback (most recent call last):
File "C:\Users\Max\Desktop\MaxsCal V.1.py", line 107, in <module>
dave = [m.start() for m in re.finditer('*', "2345234*265354*26342567*356")]
File "C:\Program Files (x86)\Python 3\lib\re.py", line 220, in finditer
return _compile(pattern, flags).finditer(string)
File "C:\Program Files (x86)\Python 3\lib\re.py", line 293, in _compile
p = sre_compile.compile(pattern, flags)
File "C:\Program Files (x86)\Python 3\lib\sre_compile.py", line 536, in compile
p = sre_parse.parse(p, flags)
File "C:\Program Files (x86)\Python 3\lib\sre_parse.py", line 829, in parse
p = _parse_sub(source, pattern, 0)
File "C:\Program Files (x86)\Python 3\lib\sre_parse.py", line 437, in _parse_sub
itemsappend(_parse(source, state))
File "C:\Program Files (x86)\Python 3\lib\sre_parse.py", line 638, in _parse
source.tell() - here + len(this))
sre_constants.error: nothing to repeat at position 0

有没有办法修复代码以提供输出，这意味着所有 * 的索引，如 [7, 14, 23].

Answer 1

re.finditer()使用正则表达式查找匹配项。在您的情况下，该正则表达式是 '*' 。 *在正则表达式中有特殊含义，所以如果你只是想搜索一个星号，你需要将它转义:

dave = [m.start() for m in re.finditer('\\*', "2345234*265354*26342567*356")]