Name: JavaScript Regular Expressions: Set Operations
Description: Set operations are a modern addition to JavaScript regex, enabled by the V flag.

Set operations are a modern addition to JavaScript regex, enabled by the V flag.

Set operations are a modern addition to JavaScript regex, enabled by the V flag. This lesson covers two powerful operations: subtraction (minus sign -) and intersection (ampersand &&). You’ll learn to subtract character sets — like excluding ambiguous characters (0, 1, I, O) from a license plate pattern — and intersect sets to find characters common to both. We also cover how the V flag enables Unicode property escapes (\p{...}) and works alongside them.

app.js

import output from "./output.js";

let str = `AIC03Z`;
// do not allow 0,1,I,O
let regex = /(?![01IO])[A-Z0-9]/g;
regex = /[[A-Z0-9]--[01IO]]/gv;
regex = /[[A-Z0-9]&&[01IO]]/gv;

output(str, regex);