虽然不可能使用正则表达式，但是以下简单代码将实现所需的结果：
def split_at(text, delimiter, opens='<([', closes='>)]', quotes='"\''):
result = []
buff = ""
level = 0
is_quoted = False
for char in text:
if char in delimiter and level == 0 and not is_quoted:
result.append(buff)
buff = ""
else:
buff += char
if char in opens:
level += 1
if char in closes:
level -= 1
if char in quotes:
is_quoted = not is_quoted
if not buff == "":
result.append(buff)
return result
在解释器中运行此命令：
>>> split_at('obj<1, 2, 3>, x(4, 5), "msg, with comma"', ',')
#=>['obj<1, 2, 3>', ' x(4, 5)', ' "msg with comma"']
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