Anonymously Replace string with Regex
# Peter Jaszkowiak (6 years ago)
All you have to do is write the regex differently:
input.replace(
/(your )(\w+)( from )(\w+)/,
(w, a, b, c, d) => `${a}${b.toUpperCase()}${c}${d.toLowerCase()}`
);
All you have to do is write the regex differently:
```
input.replace(
/(your )(\w+)( from )(\w+)/,
(w, a, b, c, d) => `${a}${b.toUpperCase()}${c}${d.toLowerCase()}`
);
```
On Fri, Sep 7, 2018, 09:08 sion <shanyy163 at 163.com> wrote:
> 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 <p.jaszkow at gmail.com> 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 <shanyy163 at 163.com> 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 <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> 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
>>> es-discuss at mozilla.org
>>> https://mail.mozilla.org/listinfo/es-discuss
>>>
>>
>>
>
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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.
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 <p.jaszkow at gmail.com> 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 <shanyy163 at 163.com <mailto:shanyy163 at 163.com>> 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 <p.jaszkow at gmail.com <mailto: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. >> >> _______________________________________________ >> es-discuss mailing list >> es-discuss at mozilla.org <mailto:es-discuss at mozilla.org> >> https://mail.mozilla.org/listinfo/es-discuss <https://mail.mozilla.org/listinfo/es-discuss> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20180907/3d67d8f6/attachment-0001.html>