为什么C++搜索不出来 C都可以求解答

来源：10-1 初识正则表达式

qq_星之所在_7

2018-10-09

PS D:pythonzhengze> python z1.py
[‘C’, ‘C’]
Traceback (most recent call last):
File “z1.py”, line 5, in
p=re.findall(‘C++’,a)
File “D:lib
e.py”, line 223, in findall
return _compile(pattern, flags).findall(string)
File “D:lib
e.py”, line 286, in _compile
p = sre_compile.compile(pattern, flags)
File “D:libsre_compile.py”, line 764, in compile
p = sre_parse.parse(p, flags)
File “D:libsre_parse.py”, line 930, in parse
p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, 0)
File “D:libsre_parse.py”, line 426, in _parse_sub
not nested and not items))
File “D:libsre_parse.py”, line 654, in _parse
source.tell() - here + len(this))
re.error: multiple repeat at position 2 图片描述