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>\d{2})-
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...
RegExp named capture groups(正则表达式命名捕获组) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 const regex = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/; const match = regex.exec('2023-06-25'); console.log(match.groups.year); // 2023 console.log(match.groups.mont...
To recall a named capture group later in the pattern, you can use the/\k<name>/syntax. Here is an example: const re = /\b(?<dup>\w+)\s+\k<dup>\b/; const match = re.exec("I'm not lazy, I'm on on energy saving mode"); ...
✔ RegExp named capture groups ✔ Rest/spread operators for object literals (...identifier) ✔ SharedArrayBufferECMAScript 2019✔ Array.prototype.flat, Array.prototype.flatMap ✔ String.prototype.trimStart, String.prototype.trimEnd ✔ Object.fromEntries ✔ Symbol.description ✔ Optional ca...
RegEx simplified with named capture groups in JavaScript August 24, 2021— Regular expressions (RegEx) are great little strings that help in solving some of the complex problems that are rather hard if we don’t use the RegExes. Read More console.trace — A better alternative to console.lo...
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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...