Enhancement of RegExp replacement

sion shanyy163 at 163.com
Fri Sep 7 14:48:44 UTC 2018

This is just a very simple example, of cause you could write it like that.

Maybe my second example is unsuitable, how about this one:

input.replace(/your \w+ from \w+/, a => a.toUpperCase(), b => b.toLowerCase());

INPUT: your friend from USA  OUTPUT: your FRIEND from usa

Actually, I am not very familiar with regex, I wonder if there is any performance issue if we support this kind of feature.

> 在 2018年9月7日,下午10:13,Peter Jaszkowiak <p.jaszkow at gmail.com> 写道:
> You do know that all capture groups are passed to the function, right? You can write your second example like this, even though the capture groups are totally useless:
> ```
> input.replace(
>   /your (\w+) from (\w+)/g, 
>   (whole, a, b) => 'your book from amazon'
> );
> ```
> On Fri, Sep 7, 2018, 07:23 sion <shanyy163 at 163.com <mailto:shanyy163 at 163.com>> wrote:
> Is it possible to enhance the string.prototype.replace(regex, func) ?
> By now, we can do something like this:
> input.replace(/(^|_)[a-z]/g, a => a[a.length - 1].toUpperCase());
> INPUT: ab_cd_ef     OUTPUT: abCdEf
> However, i want something more powerfull, like this:
> input.replace(/your (\w+) from (\w+)/g, a => 'book', b => 'amazon’);
> INPUT: your friend from china OUTPUT: your book from amazon
> As you can see, I just want the replace could replace multi fragments at the same time. And I don’t think there is any conflicts with other principles of string.prototype.replace.
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