问题

我正在尝试在Go中对字符串运行以下正则表达式：

$([0-9]+),([0-9.]+),(?:$([0-9]+))$

但是我一直收到错误消息unknown escape sequence: (

我要运行它的字符串是(1,53.38,$45) (2,88.62,$98) (3,78.48,$3) (4,72.30,$76) (5,30.18,$9) (6,46.34,$48)

所以我的问题是，如何在Go的正则表达式中转义括号？

英文:

I am tying to run the following regular expression on a string in Go

$([0-9]+),([0-9.]+),(?:$([0-9]+))$

but I keep getting the error unknown escape sequence: (

the string that I'm running it on is (1,53.38,$45) (2,88.62,$98) (3,78.48,$3) (4,72.30,$76) (5,30.18,$9) (6,46.34,$48)

So my question is, how do you escape parentheses in Go's regexp?

答案1

得分: 15

你需要转义反斜杠，因为\(不是一个有效的转义序列。

"\\(([0-9]+),([0-9.]+),(?:$([0-9]+))\\)"

更常见的做法是使用反引号来表示字符串字面量而无需转义：

`\(([0-9]+),([0-9.]+),(?:$([0-9]+))\)`

英文:

You need to escape the backslashes, because \( isn't a valid excape sequence.

&quot;\\(([0-9]+),([0-9.]+),(?:$([0-9]+))\\)&quot;

More commonly you would use backticks for string literals without escaping:

`\(([0-9]+),([0-9.]+),(?:$([0-9]+))\)`

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