Swift Regex 用于提取括号之间的单词 [英] Swift Regex for extracting words between parenthesis

问题描述

你好，我想提取 () 之间的文本.

Hello i wanna extract the text between ().

例如:

(some text) some other text -> some text
(some) some other text      -> some
(12345)  some other text    -> 12345

括号之间的字符串的最大长度应为 10 个字符.

the maximum length of the string between parenthesis should be 10 characters.

(TooLongStri) -> nothing matched because 11 characters

我目前拥有的是:

let regex   = try! NSRegularExpression(pattern: "\\(\\w+\\)", options: [])

regex.enumerateMatchesInString(text, options: [], range: NSMakeRange(0, (text as NSString).length))
{
    (result, _, _) in
        let match = (text as NSString).substringWithRange(result!.range)

        if (match.characters.count <= 10)
        {
            print(match)
        }
}

效果很好，但匹配的是:

which works nicely but the matches are :

(some text) some other text -> (some text)
(some) some other text      -> (some)
(12345)  some other text    -> (12345)

并且不匹配 <=10 因为 () 也被计算在内.

and doesn't match <=10 because () are counted also.

我该如何更改上面的代码来解决这个问题?我还想删除 if (match.characters.count <= 10) 通过扩展正则表达式来保存长度信息.

How can i change the code above to solve that? I would like also to remove the if (match.characters.count <= 10)by extending the regex to hold the length info.

推荐答案

可以使用

"(?<=\\()[^()]{1,10}(?=\\))"

查看正则表达式演示

模式:

• (?<=\\() - 断言在当前位置之前存在 ( ，如果没有则匹配失败
• [^()]{1,10} - 匹配除 ( 和 ) 之外的 1 到 10 个字符(替换 [^()] 和 \w 如果你只需要匹配字母数字/下划线字符)
• (?=\\)) - 检查当前位置后是否有文字 ) ，如果没有则匹配失败.

• (?<=\\() - asserts the presence of a ( before the current position and fails the match if there is none
• [^()]{1,10} - matches 1 to 10 characters other than ( and ) (replace [^()] with \w if you need to only match alphanumeric / underscore characters)
• (?=\\)) - checks if there is a literal ) after the current position, and fail the match if there is none.

如果您可以调整代码以获取范围 1(捕获组)的值，您可以使用更简单的正则表达式:

If you can adjust your code to get the value at Range 1 (capture group) you can use a simpler regex:

"\\(([^()]{1,10})\\)"

查看正则表达式演示.您需要的值位于 Capture 组 1 内.

See the regex demo. The value you need is inside Capture group 1.

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