Text Processing with JavaScript

exec()

The exec() method executes a search on a string. If it finds a match, it returns an array containing the search result. If not, it returns null. Here is an example:

appendix/methods/methods_ex1.js

const str = "About 100ft";
const re = /(\d+)ft/;

console.log(re.exec(str));
// → ["100ft", "100", index: 6, input: "About 100ft", groups: undefined]

The resulting array contains the matched string as the first item. If there are any capturing groups within the match, they are listed from index 1. The array also comes with three properties:

• index provides the index of the match
• input gets you the original string
• groups lists named capturing groups (if there are any)

If you use a global flag, exec() will use the value of