python - 用大括号自动替换圆括号

Question

我有以下文字：

text = "The equation is Ue^(jα)."

当第一个圆括号前面有 a 时，我想(用括号自动替换括号。{^

所以我尝试了：

text = "The equation is Ue^(jα). Some brackets like those () should stay. If this symbol ^ is alone nothing should happen. "
text = re.sub(r'^((.*?))<',r'^{\1} ', text)
text

...但它似乎不起作用。知道我怎样才能让它工作吗？

像这样的一些括号()应该保留。如果仅此符号^，则不应发生任何事情。

标签： pythonregex

Answer 1

您忘记转义一些字符：

>>> text = "The equation is Ue^(jα). Some brackets like those () should stay. If this symbol ^ is alone nothing should happen. "
>>> re.sub(r'\^\((.*?)\)',r'^{\1} ', text)
'The equation is Ue^{jα} . Some brackets like those () should stay. If this symbol ^ is alone nothing should happen. '