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

Question

Are there any differences between the two?

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

In addition, are there any significant differences in time using this or that?

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

+5

ajax333221 Sep 04 '11 at 4:20

1 answer

qwertymk · Accepted Answer · 2011-09-04T04:26:35+0000

No, at first iin the end it makes the case insensitive, which does not matter if the letter it finds is upper or lower case.

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