Menu
From the MDN docs it states
matchAll only returns the first match if the g flag is missing.
But if you run this code:
const regexp = RegExp('[a-c]', '');
const str = 'abc';
console.log(Array.from(str.matchAll(regexp), m => m[0]));
// Array [ "a" ]in a recent version of chrome you get the following error:
Error: undefineds called with a non-global RegExp argument
I'm on chrome version 80.0.3987.116
I'm not sure if this is a chrome issue or the MDN documentation needs to be updated.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll
682
The g flag indicates that the regular expression should be tested against all possible matches in a string.
matchAll() The matchAll() method returns an iterator of all results matching a string against a regular expression, including capturing groups.
To find find all the matches of a regular expression in this string in JavaScript, call match() method on this string, and pass the regular expression as argument. match() method returns an array of strings containing all the matches found for the given regular expression, in this string.
exec(str) The regexp. exec(str) method returns a match for regexp in the string str .
The information presented to you on MDN, in this instance, is wrong.
The Official ECMA Specification, ECMA-262 as of February 15, 2020( See here ), states that if there is no g flag present, that matchAll should throw a TypeError.
See specifically 2.b.iii below.
The error message is obviously fairly confusing with its phrasing, but still correct.
109
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
