What does this regex `str.gsub(/\#{(.*?)}/)` do?
This question already has an answer here:
.* is a greedy match, whereas .*? is a non-greedy match. See this link for a quick tutorial on them. Greedy matches will match as much as they can, while non-greedy matches will match as little as they can.
In this example, the greedy variant grabs everything between the first { and the last } (the last closing brace):
'start #{this is a match}{and so is this} end'.match(/#{(.*)}/)[1]
# => "this is a match}{and so is this"
while the non-greedy variant reads as little as it needs to make the match, so it only reads between the first { and the first successive } .
'start #{this is a match}{and so is this} end'.match(/#{(.*?)}/)[1]
# => "this is a match"
上一篇: 在第一个字符比赛停止？