英文:
Removing single quotes from a string - "Cannot use "'" (type untyped string) as type byte"
问题
我有一个字符串，可能被双引号或单引号包围。如果存在的话，我想要去掉第一对引号。所以：
"foo" --> foo
""foo"" --> "foo"
'foo' --> foo
'foo --> foo
等等。
我找到了这个答案，它描述了使用切片表达式来索引字符串的第一个和最后一个字符，然后如果任一字符是引号，就获取字符串的一个切片。所以我尝试修改代码来处理单引号和双引号：
func stripQuotes(str string) string {
s := str[:]
if len(s) > 0 && (s[0] == ''' || s[0] == "'") {
s = s[1:]
}
if len(s) > 0 && (s[len(s)-1] == ''' || s[len(s)-1] == "'") {
s = s[:len(s)-1]
}
return s
}
但是它返回一个错误：
cannot convert "'" (type untyped string) to type byte
所以我尝试将单引号转换为字节，但也不起作用：
...
if len(s) > 0 && (s[0] == ''' || s[0] == byte("'")) {
...
它返回错误：
cannot convert "'" (type untyped string) to type byte
我知道我在这里缺少一些基本的字符串处理知识，但我不确定是什么。有没有一种简单的方法来识别字符串中的单引号？
英文:
I have a string that may or may not be surrounded with double quotes or single quotes. I want to remove the first set of quotes, if present. So:
"foo" --> foo
""foo"" --> "foo"
'foo' --> foo
'foo --> foo
Etc.
I found this answer, which describes using a slice expression to index into the first and last characters of the string, then grab a slice of the string if either character is a quote. So I tried to tweak the code to cover both single and double quotes:
func stripQuotes(str string) string {
s := str[:]
if len(s) > 0 && (s[0] == '"' || s[0] == "'") {
s = s[1:]
}
if len(s) > 0 && (s[len(s)-1] == '"' || s[len(s)-1] == "'") {
s = s[:len(s)-1]
}
return s
}
But it returns an error:
cannot convert "'" (type untyped string) to type byte
So I tried converting the single quote to a byte, but that didn't work either:
...
if len(s) > 0 && (s[0] == '"' || s[0] == byte("'")) {
...
It returns the error:
cannot convert "'" (type untyped string) to type byte
I know that there's some basic string handling knowledge I'm missing here, but I'm not sure what. Is there a simple way to identify single quotes in a string?
答案1
得分: 7
在Go语言中，双引号表示字符串字面量，单引号表示rune或byte字面量。它们不像其他语言中可以互换使用。
因此，一个单引号的字面量应该写作'\''。
英文:
In Go, double quotes denote string literals and single quotes denote rune or byte literals. They are not interchangeable like in other languages.
A literal single quote is therefore spelled '\''.
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