Question

所以我有這樣的：

z='===hello 
there===, 
how are ===you===?' 

而且我想：

z='<b>hello 
there<\b>, 
how are <b>you<\b>?' 

我試着這樣做：

z = re.sub(r"\={3}([^\$]+)\={3}", r"<b> \\1 </b>", z, re.M) 

和它的作品的那種，但我取而代之：

z='<b>hello 
there===, 
how are ===you<\b>?' 

我還是一個新手，但我相信它是^和$，它使它匹配字符串的開頭和結尾。那麼如何改變它，使它與中間的相匹配？從蟒蛇DOC

Answer 1

re.sub(r"\={3}([^\$]+?)\={3}", r"<b> \\1 </b>", z, re.M) 

複製：

*?, +?, ?? The '*', '+', and '?' qualifiers are all greedy; they match as much text as possible. Sometimes this behaviour isn’t desired; if the RE <.*> is matched against '<H1>title</H1>', it will match the entire string, and not just '<H1>'. Adding '?' after the qualifier makes it perform the match in non-greedy or minimal fashion; as few characters as possible will be matched. Using .*? in the previous expression will match only '<H1>'.