组匹配的一个问题是,每一组的匹配含义不容易看出来,而且只能用数字序号(比如matchObj[1])引用,要是组的顺序变了,引用的时候就必须修改序号。 ES2018 引入了具名组匹配(Named Capture Groups),允许为每一个组匹配指定一个名字,既便于阅读代码,又便于引用。 const RE_DATE = /(?<year>\d{4})-(?<month>\...
以前的 capture group 会用 \1, \2 来back reference, 同理 named group 也一样可以, 语法是 \k<name>, k 的意思我猜是 duplicate? const date = '2019-12-12' const re = /(?<year>\d{4})-(?<monthAndDay>\d{1,2})-\k<monthAndDay>/ console.log(re.test(date)) // → true 记住...
例如,如果是用 /(\a+)(\b+)/ 这个来匹配,p1 就是匹配的 \a+,p2 就是匹配的 \b+。 offset 匹配到的子字符串在原字符串中的偏移量。(比如,如果原字符串是 'abcd',匹配到的子字符串是'bc',那么这个参数将会是 1) string 被匹配的原字符串。 NamedCaptureGroup 命名捕获组匹配的对象...
If you want to use a function to perform the replacement, you can reference the named groups the same way you would reference numbered groups. The value of the first capture group will be available as the second argument to the function, and the value of the second capture group will be ...
/(?<foo>a)(?<foo>b)/// SyntaxError: Duplicate capture group name 反向引用一个不存在的分组名: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /\k<foo>/u// SyntaxError: Invalid named capture referenced/\k<foo>/.test("k<foo>")// true, 非 Unicode 下为了向后兼容,k 前面的 \ 会...
✔ RegExp named capture groups ✔ Rest/spread operators for object literals (...identifier) ✔ SharedArrayBuffer ECMAScript 2019 ✔Array.prototype.flat,Array.prototype.flatMap ✔String.prototype.trimStart,String.prototype.trimEnd ✔Object.fromEntries ...
e.srcElement.releaseCapture(); if(New_CW.document.body.offsetWidth==screen.width && New_CW.document.body.offsetHeight==screen.height) return; CW_top = e.screenX-drag_x; CW_left = e.screenY-drag_y; } </SCRIPT> </HTML> 贴两个关于treeview的 ...
SuperExpressive() .capture .range('a', 'f') .range('0', '9') .string('XXX') .end() .toRegex(); // -> /([a-f][0-9]XXX)/.namedCapture(name)Creates a named capture group for the proceeding elements. Needs to be finalised with .end(). Can be later referenced with named...
.groups()- grab any named capture-groups from a match .wordCount()- count the # of terms in the document .confidence()- an average score for pos tag interpretations Match (match methods use thematch-syntax.) .match('')- return a new Doc, with this one as a parent ...
第十六章:变量:作用域、环境和闭包 原文:16. Variables: Scopes, Environments, and Closures 译者:飞龙 协议:CC BY-NC-SA 4.0 本章首先解释了如何使用变量,然后详细介绍了它们的工作方式(环境、闭包等)。 声明变量 在 JavaScrip