Can't understand the difference between + and g flag

JavaScript
1

The

let reCriminals = /C+/;

and

let reCriminals = /C+/g;

have the same output. What is the difference?

2

The g flag will match more than the first occurrence of the regex’s match. Without the g flag, only the first occurrence is found.

const regex1 = /C+/;
const regex2 = /C+/g;

const string = 'abCCCdeCffghCCCzz';

const matchOfRegex1 = string.match(regex1);
const matchOfRegex2 = string.match(regex2);

console.log(matchOfRegex1); // [ 'CCC', index: 2, input: 'abCCCdeCffghCCCzz', groups: undefined ]
console.log(matchOfRegex2); // [ 'CCC', 'C', 'CCC' ]
2 Likes
3

Hello!

Let’s take the string CC something something CC something CC.

The first regex (/C+/) would match only the first CC:

image

The second one would search the entire string, matching every occurrence of CC:

image

4

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