To create a named capture group in JavaScript, you can use the syntax(?<name>pattern), wherenameis the name you want to assign to the group, andpatternis theregular expression patternfor that group. JavaScript regex named group example Simple example code that demonstrates how to use named c...
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>\...
letpetString ="James has a pet cat.";letpetRegex =/dog|cat|bird|fish/;letresult = petRegex.test(petString);// true 忽略大小写 Ignore Case 有时候,并不关注匹配字母的大小写。 可以使用标志(flag)来匹配这两种情况。忽略大小写的标志——i。 可以通过将它附加到正则表达式之后来使用它。 letmyStrin...
RegExp named capture groups(正则表达式命名捕获组) 代码语言:javascript 复制 constregex=/(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/;constmatch=regex.exec('2023-06-25');console.log(match.groups.year);// 2023console.log(match.groups.month);// 06console.log(match.groups.day);...
capture1, // 第一个组匹配 2015 capture2, // 第二个组匹配 01 capture3, // 第三个组匹配 02 position, // 匹配开始的位置 0 S, // 原字符串 2015-01-02 groups // 具名组构成的一个对象 {year, month, day} ) => { let { day, month, year } = groups ...
这种方法的好处就是在你的正则里写好了 named group 之后, 在写解构赋值的时候直接对着上面的正则写即可, 就不会出错了. 反向引用 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?
var topicRegex = /&topic=(\d+)/g; // note the g flag var results = []; var testString = "p=activity-feed&topic=1697&no_match=1111&topic=9999"; var match; while (match = reg.exec(testString)) { results.push(match[1]); // indexing at 1 pulls capture result } console.log(...
let capture = match_value.group(i); let captured_value = match capture { // b. If captureI is undefined, let capturedValue be undefined. None => JsValue::undefined(), // c. Else if fullUnicode is true, then // d. Else,
Named capture groups for JavaScript RegExps. Contribute to tc39/proposal-regexp-named-groups development by creating an account on GitHub.
This regular expression finds consecutive duplicate words in a sentence. If you prefer, you can also recall a named capture group using a numbered back reference: const re = /\b(?<dup>\w+)\s+\1\b/; const match = re.exec("I'm not lazy, I'm on on energy saving mode"); ...