Emmmmm, pretty sorry for misleading you… Your solution will not work if I just provide you a regex without telling you detail information, all I want is replace first and second word matched by the regex, nothing more.
> 在 2018年9月7日，下午10:57，Peter Jaszkowiak <[email protected]> 写道： > > ``` > input.replace( > /your (\w+) from (\w+)/, > (w, a, b) => `your ${a.toUpperCase()} from ${b.toLowerCase()}` > ); > ``` > > On Fri, Sep 7, 2018, 08:49 sion <[email protected] > <mailto:[email protected]>> wrote: > 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 <[email protected] >> <mailto:[email protected]>> 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 <[email protected] >> <mailto:[email protected]>> 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. >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] <mailto:[email protected]> >> https://mail.mozilla.org/listinfo/es-discuss >> <https://mail.mozilla.org/listinfo/es-discuss> >
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