When a regular expression is known in advance, it is considered a best practice to avoid the string literal notation on top of the regular expression notation, and use regular expression literals instead of the constructor function.

// bad practice:
const number  = new RegExp("^\d\.$");
// recommended:
const number_ = /^\d\.$/;

Regex literals are easier to read and do not require a call to the RegExp constructor at runtime.

Bad Practice

new RegExp("abc");

new RegExp("abc", "u");

RegExp("abc");

RegExp("abc", "u");

new RegExp("\d\d\.\d\d\.\d\d\d\d");

RegExp(`^\d\.$`);

new RegExp(String.raw`^\d\.$`);

Recommended

/abc/;

/abc/u;

/\d\d\.\d\d\.\d\d\d\d/;

/^\d\.$/;

// RegExp constructor is allowed for dynamically generated regular expressions

new RegExp(pattern);

RegExp("abc", flags);

new RegExp(prefix + "abc");

RegExp(`${prefix}abc`);

new RegExp(String.raw`^\d\. ${sufix}`);

willtheorangeguy / Note-Style-Guide

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