Question

159

Differences between replace(/[^a-z0-9]/gi, '') and replace(/[^a-zA-Z0-9]/g, '')

rated 0 times [ 162] [ 3] / answers: 1 / hits: 17772 / 13 Years ago, sun, september 4, 2011, 12:00:00

Are there differences between these two?

replace(/[^a-z0-9]/gi, '');

replace(/[^a-zA-Z0-9]/g, '');

Also, are there any significant differences in time using one or another?

edit: about the performance, I did some testing http://jsperf.com/myregexp-test

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

ishmaelw

Add To Favorites

Follow

Total Points: 528

Total Questions: 96

Total Answers: 103

Location: Venezuela

Member since Sat, Apr 24, 2021

3 Years ago

answered 13 Years ago margaritakristinak · Accepted Answer

Nope, by the first, the i at the end makes the regex case insensitive meaning that it doesn't matter if the letter it finds is upper- or lower-case.

The second matches upper- and lower-case letters but makes sure they are either upper- or lower-case. So you end up with the same result.