[英]Regex for string starting with quote but not with escape character
I have to find a string which start and end with double quotes and then change its color.我必须找到一个以双引号开头和结尾的字符串,然后更改其颜色。 But if there is escape character (/) with quote then it will not be considered as string and color will not be changed.
但是如果有带引号的转义字符(/),那么它不会被视为字符串并且颜色不会改变。
For example:例如:
The first example will be considered as string while the second example will not be considered as a string.第一个示例将被视为字符串,而第二个示例将不被视为字符串。
How to write a regex in javascript which only returns a string which starts and ends with double quotes but there should not have any escape character (/)如何在javascript中编写一个regex,它只返回一个以双引号开头和结尾的字符串,但不应该有任何转义字符(/)
Don't need a regex here - simple first character check with charAt
:这里不需要正则表达式 - 使用
charAt
简单的第一个字符检查:
const strings = [`"hello"`, `\\\\"hello\\\\"`]; strings.forEach(s => console.log(s.charAt(0) == `"`));
If you really need a regex:如果你真的需要一个正则表达式:
const strings = [`"hello"`, `\\\\"hello\\\\"`]; const regex = /^[\\"]/; strings.forEach(s => console.log(regex.test(s)));
A possible solution would be using JSON.parse()
, since a string like "hello"
is also a valid JSON object, while a string like "hello\\"
is not.一个可能的解决方案是使用
JSON.parse()
,因为像"hello"
这样的字符串也是一个有效的 JSON 对象,而像"hello\\"
这样的字符串不是。
function checkString(str){
try {
// let's try to parse the string as a JSON object
const parsed = JSON.parse(str);
// check if the result is a valid javascript string
return (parsed === String(parsed));
}
catch(error){
return false;
}
}
EDIT:编辑:
If you have an array of objects, and you need to find which object is a valid string, you can do this:如果您有一个对象数组,并且需要查找哪个对象是有效字符串,则可以执行以下操作:
const strings = ['"valid string"', '"not valid string\\"'];
const validStrings = strings.filter((e) => {
return (e === String(e) && checkString(e));
});
You can use this pattern你可以使用这个模式
^(?!.*\/)".*"$
^
- start of string ^
- 字符串的开始(?!.*\\\\)
- condition to avoid any \\
(?!.*\\\\)
- 避免任何\\
条件"
- Matches "
"
- 匹配"
.*
- Matches anything except new line .*
- 匹配除新行以外的任何内容$
- End of string $
- 字符串结束 const strings = [`"hello"`, `\\\\"hello\\\\"`, `\\\\"hello`, `hello"\\\\`, `"hel/lo"`,]; strings.forEach(s => { if(/^(?!.*\\\\)".*"$/.test(s)){ console.log(s) } });
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