javascript replace(/[^a-z0-9]/gi, '') 和 replace(/[^a-zA-Z0-9]/g, '') 的区别
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Differences between replace(/[^a-z0-9]/gi, '') and replace(/[^a-zA-Z0-9]/g, '')
提问by ajax333221
Are there differences between these two?
这两者之间有区别吗？
replace(/[^a-z0-9]/gi, '');
replace(/[^a-zA-Z0-9]/g, '');
Also, are there any significant differences in time using one or another?
此外，使用一种或另一种在时间上是否存在显着差异？
edit:about the performance, I did some testing http://jsperf.com/myregexp-test
编辑：关于性能，我做了一些测试http://jsperf.com/myregexp-test
采纳答案by qwertymk
Nope, by the first, the iat the end makes the regex case insensitive meaning that it doesn't matter if the letter it finds is upper- or lower-case.
不，首先，i最后使正则表达式不区分大小写，这意味着它找到的字母是大写还是小写都没有关系。
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.
第二个匹配大写和小写字母，但确保它们是大写或小写。所以你最终会得到相同的结果。
