英文:
Go regexp to detect backslash character
问题
在Go语言中，要检测反斜杠字符本身，你可以使用双反斜杠来表示反斜杠。以下是你可以尝试的代码：
str := "I have Hello \\\"World\\\""
var validID = regexp.MustCompile(`[.!?]`)
var validBackslash = regexp.MustCompile(`\\\\`)
在正则表达式中，\\表示一个反斜杠字符。因为反斜杠在正则表达式中有特殊含义，所以需要使用两个反斜杠来表示一个反斜杠字符本身。
英文:
In go, how do I detect \ back slash character itself?
str := "I have Hello \"World\""
var validID = regexp.MustCompile(`[.!?]`)
this is how I detect . ! ? characters but
var validID = regexp.MustCompile(`[\]`)
does not detect the backslash in the string.
How do I denote backslash in go regular expression?
答案1
得分: 3
你需要对它进行转义，即使在字符类中也是如此；否则它会认为你试图转义]：
var validID = regexp.MustCompile(`[\\]`)
但是，你也可以完全去掉字符类：
var validID = regexp.MustCompile(`\\`)
还要注意，字符串"I have Hello \"World\""实际上不包含任何反斜杠。\\"是一个转义序列，表示双引号。如果你想创建一个包含反斜杠的字符串，请使用：
str := "I have Hello \\\"World\\\""
或者
str := `I have Hello \"World\"`
可以在这里找到一个可工作的演示。
英文:
You'll need to escape it, even in a character class; otherwise it will think you're trying to escape the ]:
var validID = regexp.MustCompile(`[\\]`)
But for that matter, you can just get rid of the character class entirely:
var validID = regexp.MustCompile(`\\`)
Also note that the string "I have Hello \"World\"" does not actually contain any backlashes. \" is an escape sequence a double quote. If you want to create a string with backslashes use:
str := "I have Hello \\\"World\\\""
Or
str := `I have Hello \"World\"`
A working demonstration can be found here.
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