【學習筆記】JavaScript - Regex 正則表達式

The right way to assign a RegExp to a variable is by using new, since it's a constructor, but it also works without it.

A regular expression is a sequence of characters that forms a search pattern. The search pattern can be used for text search and text replace operations. JavaScript Operator Precedence · JavaScript String Methods · Try it Yourself · Tr

A regular expression is a pattern of characters. The pattern is used for searching and replacing characters in strings.

RegExp：是正则表达式（regular expression）的简写。 完整RegExp 对象参考手册. 请查看我们的JavaScript RegExp 对象的参考手册，其中提供了可以与字符串对象一同使用 ...

The RegExp object defines patterns for matching and manipulating strings in JavaScript. Regular Expressions perform pattern-based searches, replacements, or ...

The expression new RegExp(/ab+c/, flags) will create a new RegExp using the source of the first parameter and the flags provided by the second. RegExp.$1, …, RegExp.$9 · RegExp() constructor · RegExp.escape()

3 天前 · The RegExp() constructor creates RegExp objects. For an introduction to regular expressions, read the Regular Expressions chapter in the JavaScript Guide. RegExp · RegExp.$1, …, RegExp.$9 · RegExp.escape() · RegExp: lastIn

Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects.

* 表示前一個字元可以是0 個或多個，例如/ab*c/，因此ac, abc, abbbbc 都符合規則。 + 表示前一個字元可以是1 個或多個，例如/a+b/ ，ab, aaaaab 都符合規則。

... javascript= let reStr = /abc/ ``` + 建構式：直接new 一個RegExp 物件`new RegExp()` + 適合需動態產生pattern 時使用```javascript= let reStr = new RegExp('abc ...