使用变量存储正则表达式(减少正则编译过程); 使用固化分组加快匹配失败的速度(js 中并不支持固化分组); 参考 《精通正则表达式》 POSIX-wikipedia DFA-wikipedia NFA-wikipedia REGEXP_MDN RegExpecma-262#sec-regexp-regular-expression-objects 博客文章 unicode-编码官网
Atomic groups and possessive quantifiers are another powerful set of features added by theregexlibrary. Although they’re primarily about performance and resilience against catastrophic backtracking (also known as ReDoS or “regular expression denial of service,” a serious issue where certain regexes can...
Turns out, if you use replace with a regular expression, you can reference included capture groups using $1, $2, etc.. MDN provides a good example to swap words using references. const re = /(\w+)\s(\w+)/; const str = 'Jane Smith'; const newstr = str.replace(re, '$2, $1...
This is where you take the knowledge you learned and try to answer those questions. Explore the following resources to help you in your journey and experiment!RegExp on MDN RegExr (Regular Expression Playground)Thanks for learning with the DigitalOcean Community. Check out our offerings for ...
We can omit the step of judging the newline by ourselves, directly match the beginning and end of each line, and then use the regular expression flag m to enable multi-line matching mode: /^(\+|\-).*$/gm. Code: const content = `+ import { Plugin } from ".."; - CONST SUM =...
Simple but powerful glob to regular expression compiler. Install npm install globrex --save Core Features 💪extended globbing:transform advanceExtGlobfeatures 📦simple: no dependencies 🛣️paths: split paths into multipleRegExpsegments Usage ...
Yes. I found this short note in theMDN site: If you need to know if a string matches a regular expression regexp, use regexp.test(string). Is the difference significant? The answer once more isYES! ThisjsPerfI put together shows the difference is~30% - ~60%depending on the browser:...
jsCopy to Clipboard exec(str) 参数 str 要匹配正则表达式的字符串。返回值 如果匹配失败,exec() 方法返回 null,并将正则表达式的 lastIndex 重置为 0。 如果匹配成功,exec() 方法返回一个数组,并更新正则表达式对象的 lastIndex 属性。完全匹配成功的文本将作为返回数组的第一项,从第二项起,后续每项都对应...