Javascript正则表达式查找不以“”开头的单词;我的:"

Javascript regex to find words that do not start with "my:"

本文关键字:单词 我的 quot 开头 查找 正则表达式 Javascript      更新时间:2023-09-26

我正在尝试编写一个正则表达式,它将在大括号之间查找所有不以"my:"开头的值。例如,我想捕获{this},但不想捕获{my:monkey}

捕捉一切的模式是:

'{([^'}]*)'}

我很难让它工作。到目前为止,我最接近的镜头是:

'{[^my:]*([^'}]*)'}

这会失败,因为它只忽略以"m"、"y"或":"开头的标记。

我确信我忽略了一个命令,将"my:"视为一个块。。

(注意:必须适用于Javascript)

这个应该做:

/'{((?!my:)[^}]+)'}/g

查看快速演示http://jsbin.com/ujazul/2/edit

总结如下:

// test match thing_done but not some_thing_done (using nagative lookbehind)
console.log(/(?<!some_)thing_done/.test("thing_done")); // true
console.log(/(?<!some_)thing_done/.test("some_thing_done")); // false
// test match thing_done but not think_done_now (using nagative lookahead)
console.log(/thing_done(?!_now)/.test("thing_done")); // true
console.log(/thing_done(?!_now)/.test("thing_done_now")); // false
// test match some_thing_done but not some_thing (using positive lookbehind)
console.log(/(?<=some_)thing_done/.test("thing_done")); // false
console.log(/(?<=some_)thing_done/.test("some_thing_done")); // true
// test match thing_done but not think_done_now (using positive lookahead)
console.log(/thing_done(?=_now)/.test("thing_done")); // false
console.log(/thing_done(?=_now)/.test("thing_done_now")); // true

对话版本:

I need match some_thing_done not thing_done:
  Put `some_` in brace: (some_)thing_done
  Then put ask mark at start: (?some_)thing_done
  Then need to match before so add (<): (?<some_)thing_done
  Then need to equal so add (<): (?<=some_)thing_done
--> (?<=some_)thing_done
    ?<=some_: conditional back equal `some_` string

链接示例代码:https://jsbin.com/yohedoqaxu/edit?js,控制台

您可以这样做:

var input = "I want to capture {this} but not {my:monkey}";
var output = input.replace(/{(my:)?([^}]*)}/g, function($0, $1, $2) { 
    return $1 ? $0 : "[MATCH]"; 
});
// I want to capture [MATCH] but not {my:monkey}

{(?!my:)(.*?)}在regex pal中工作:http://preview.tinyurl.com/nkcpoy7