How can you add e.g. 'gm' to a regex to avoid repeating the full regex again?

Asked May 27 '21 at 22:32

Active May 27 '21 at 22:33

Viewed 17 times

I would like to define two regexs where the only difference is that one is global/multiline while the other is not.

How can I define them so that I don't have to repeat the full regex, i.e. use the first as a variable?

const regex1 = /(\[.*?\])/;
// const regex2 = /(\[.*?\])/gm;
const regex2 = regex1 + 'gm'; // error

edited May 27 '21 at 22:33

asked May 27 '21 at 22:32

Edward Tanguay

3

`const regex2 = new RegExp(regex1, 'gm')` – Wiktor Stribiżew May 27 '21 at 22:33
Sorry, string concatenation actually works (I had a typo) as does `const regex2 = \`${regex1}gm\`` but your solution is cleaner, thanks. – Edward Tanguay May 27 '21 at 22:37
Since there are no anchors in your pattern, you don't need the m modifier, but perhaps it's only an example. – Casimir et Hippolyte May 27 '21 at 22:50

0 Answers0