Re: [R] A question on regular expression
Regular expressions are in much more widespread use than merely R... and there
are correspondingly more resources for learning than just R-help. Please do
make use of them. Here are a couple that googling "regex character set carat"
found:
https://www.regular-expressions.info/charclass.html
https://stackoverflow.com/questions/23352038/regex-excluding-specific-characters
On September 13, 2019 3:59:07 AM PDT, Christofer Bogaso
wrote:
>A quick question.
>
>Could you please explain the -- [^}]* -- part in finding the pattern?
>
>On Fri, Sep 13, 2019 at 12:19 AM Bert Gunter
>wrote:
>>
>>
>> You can't use the same regex for str_extract_all as I used for sub
>(or gsub, which is what is required here)! If you do this sort of thing
>a lot, you *must* learn more about regex's.
>>
>> Anyway, this will do what you want I think:
>>
>> z <- paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " ") ## just for
>readability
>>
>> > str_extract_all(z,"\\{[^}]*\\}")
>> [[1]]
>> [1] "{cd$ }" "{cad$ }"
>>
>> Cheers,
>> Bert
>>
>> On Thu, Sep 12, 2019 at 10:12 AM Christofer Bogaso
> wrote:
>>>
>>> Thanks Bert,
>>>
>>> This works, but if in my text there are more than one patterns then
>>> fails to generate desired result.
>>>
>>> library(stringr)
>>> str_extract_all(paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " "),
>>> ".*(\\{.*\\}).*")
>>>
>>> This generates below -
>>>
>>> [[1]]
>>>
>>> [1] "ab{cd$ }ed ab{cad$ }ed"
>>>
>>> I was expecting I would get a vector of length 2 with desired
>pattern.
>>>
>>> Where did I make any mistake?
>>>
>>> Thanks,
>>>
>>> On Thu, Sep 12, 2019 at 10:29 PM Bert Gunter
> wrote:
>>> >
>>> > > sub(".*(\\{.*\\}).*", "\\1","ab{cd$ }ed")
>>> > [1] "{cd$ }"
>>> >
>>> > Use ".+" instead of ".*" within the {} if you don't want to return
>empty {}'s.
>>> >
>>> > You might wish to use the stringr package for string matching and
>manipulation, as it provides a more user friendly and consistent
>interface to these tasks.
>>> >
>>> >
>>> > Bert Gunter
>>> >
>>> > "The trouble with having an open mind is that people keep coming
>along and sticking things into it."
>>> > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>>> >
>>> >
>>> > On Thu, Sep 12, 2019 at 9:31 AM Christofer Bogaso
> wrote:
>>> >>
>>> >> Hi,
>>> >>
>>> >> I am wondering on what is the correct way to select a pattern
>which goes as -
>>> >>
>>> >> {"(any character with any length)"}
>>> >>
>>> >> The expressions " {" " and " "} " both are included in the
>pattern.
>>> >>
>>> >> For example, the lookup of the above pattern in the text "
>>> >> {"asaf455%"}57573blabla " will result in {"asaf455%"}
>>> >>
>>> >> Any help will be highly appreciated.
>>> >>
>>> >> Thanks,
>>> >>
>>> >> __
>>> >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>> >> https://stat.ethz.ch/mailman/listinfo/r-help
>>> >> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>>> >> and provide commented, minimal, self-contained, reproducible
>code.
>
>__
>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
--
Sent from my phone. Please excuse my brevity.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] A question on regular expression
A quick question.
Could you please explain the -- [^}]* -- part in finding the pattern?
On Fri, Sep 13, 2019 at 12:19 AM Bert Gunter wrote:
>
>
> You can't use the same regex for str_extract_all as I used for sub (or gsub,
> which is what is required here)! If you do this sort of thing a lot, you
> *must* learn more about regex's.
>
> Anyway, this will do what you want I think:
>
> z <- paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " ") ## just for
> readability
>
> > str_extract_all(z,"\\{[^}]*\\}")
> [[1]]
> [1] "{cd$ }" "{cad$ }"
>
> Cheers,
> Bert
>
> On Thu, Sep 12, 2019 at 10:12 AM Christofer Bogaso
> wrote:
>>
>> Thanks Bert,
>>
>> This works, but if in my text there are more than one patterns then
>> fails to generate desired result.
>>
>> library(stringr)
>> str_extract_all(paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " "),
>> ".*(\\{.*\\}).*")
>>
>> This generates below -
>>
>> [[1]]
>>
>> [1] "ab{cd$ }ed ab{cad$ }ed"
>>
>> I was expecting I would get a vector of length 2 with desired pattern.
>>
>> Where did I make any mistake?
>>
>> Thanks,
>>
>> On Thu, Sep 12, 2019 at 10:29 PM Bert Gunter wrote:
>> >
>> > > sub(".*(\\{.*\\}).*", "\\1","ab{cd$ }ed")
>> > [1] "{cd$ }"
>> >
>> > Use ".+" instead of ".*" within the {} if you don't want to return empty
>> > {}'s.
>> >
>> > You might wish to use the stringr package for string matching and
>> > manipulation, as it provides a more user friendly and consistent interface
>> > to these tasks.
>> >
>> >
>> > Bert Gunter
>> >
>> > "The trouble with having an open mind is that people keep coming along and
>> > sticking things into it."
>> > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>> >
>> >
>> > On Thu, Sep 12, 2019 at 9:31 AM Christofer Bogaso
>> > wrote:
>> >>
>> >> Hi,
>> >>
>> >> I am wondering on what is the correct way to select a pattern which goes
>> >> as -
>> >>
>> >> {"(any character with any length)"}
>> >>
>> >> The expressions " {" " and " "} " both are included in the pattern.
>> >>
>> >> For example, the lookup of the above pattern in the text "
>> >> {"asaf455%"}57573blabla " will result in {"asaf455%"}
>> >>
>> >> Any help will be highly appreciated.
>> >>
>> >> Thanks,
>> >>
>> >> __
>> >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> >> https://stat.ethz.ch/mailman/listinfo/r-help
>> >> PLEASE do read the posting guide
>> >> http://www.R-project.org/posting-guide.html
>> >> and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] A question on regular expression
Awesome, thanks!
On Fri, Sep 13, 2019 at 12:19 AM Bert Gunter wrote:
>
>
> You can't use the same regex for str_extract_all as I used for sub (or gsub,
> which is what is required here)! If you do this sort of thing a lot, you
> *must* learn more about regex's.
>
> Anyway, this will do what you want I think:
>
> z <- paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " ") ## just for
> readability
>
> > str_extract_all(z,"\\{[^}]*\\}")
> [[1]]
> [1] "{cd$ }" "{cad$ }"
>
> Cheers,
> Bert
>
> On Thu, Sep 12, 2019 at 10:12 AM Christofer Bogaso
> wrote:
>>
>> Thanks Bert,
>>
>> This works, but if in my text there are more than one patterns then
>> fails to generate desired result.
>>
>> library(stringr)
>> str_extract_all(paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " "),
>> ".*(\\{.*\\}).*")
>>
>> This generates below -
>>
>> [[1]]
>>
>> [1] "ab{cd$ }ed ab{cad$ }ed"
>>
>> I was expecting I would get a vector of length 2 with desired pattern.
>>
>> Where did I make any mistake?
>>
>> Thanks,
>>
>> On Thu, Sep 12, 2019 at 10:29 PM Bert Gunter wrote:
>> >
>> > > sub(".*(\\{.*\\}).*", "\\1","ab{cd$ }ed")
>> > [1] "{cd$ }"
>> >
>> > Use ".+" instead of ".*" within the {} if you don't want to return empty
>> > {}'s.
>> >
>> > You might wish to use the stringr package for string matching and
>> > manipulation, as it provides a more user friendly and consistent interface
>> > to these tasks.
>> >
>> >
>> > Bert Gunter
>> >
>> > "The trouble with having an open mind is that people keep coming along and
>> > sticking things into it."
>> > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>> >
>> >
>> > On Thu, Sep 12, 2019 at 9:31 AM Christofer Bogaso
>> > wrote:
>> >>
>> >> Hi,
>> >>
>> >> I am wondering on what is the correct way to select a pattern which goes
>> >> as -
>> >>
>> >> {"(any character with any length)"}
>> >>
>> >> The expressions " {" " and " "} " both are included in the pattern.
>> >>
>> >> For example, the lookup of the above pattern in the text "
>> >> {"asaf455%"}57573blabla " will result in {"asaf455%"}
>> >>
>> >> Any help will be highly appreciated.
>> >>
>> >> Thanks,
>> >>
>> >> __
>> >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> >> https://stat.ethz.ch/mailman/listinfo/r-help
>> >> PLEASE do read the posting guide
>> >> http://www.R-project.org/posting-guide.html
>> >> and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] A question on regular expression
You can't use the same regex for str_extract_all as I used for sub (or
gsub, which is what is required here)! If you do this sort of thing a lot,
you *must* learn more about regex's.
Anyway, this will do what you want I think:
z <- paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " ") ## just for
readability
> str_extract_all(z,"\\{[^}]*\\}")
[[1]]
[1] "{cd$ }" "{cad$ }"
Cheers,
Bert
On Thu, Sep 12, 2019 at 10:12 AM Christofer Bogaso <
bogaso.christo...@gmail.com> wrote:
> Thanks Bert,
>
> This works, but if in my text there are more than one patterns then
> fails to generate desired result.
>
> library(stringr)
> str_extract_all(paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " "),
> ".*(\\{.*\\}).*")
>
> This generates below -
>
> [[1]]
>
> [1] "ab{cd$ }ed ab{cad$ }ed"
>
> I was expecting I would get a vector of length 2 with desired pattern.
>
> Where did I make any mistake?
>
> Thanks,
>
> On Thu, Sep 12, 2019 at 10:29 PM Bert Gunter
> wrote:
> >
> > > sub(".*(\\{.*\\}).*", "\\1","ab{cd$ }ed")
> > [1] "{cd$ }"
> >
> > Use ".+" instead of ".*" within the {} if you don't want to return empty
> {}'s.
> >
> > You might wish to use the stringr package for string matching and
> manipulation, as it provides a more user friendly and consistent interface
> to these tasks.
> >
> >
> > Bert Gunter
> >
> > "The trouble with having an open mind is that people keep coming along
> and sticking things into it."
> > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >
> >
> > On Thu, Sep 12, 2019 at 9:31 AM Christofer Bogaso <
> bogaso.christo...@gmail.com> wrote:
> >>
> >> Hi,
> >>
> >> I am wondering on what is the correct way to select a pattern which
> goes as -
> >>
> >> {"(any character with any length)"}
> >>
> >> The expressions " {" " and " "} " both are included in the pattern.
> >>
> >> For example, the lookup of the above pattern in the text "
> >> {"asaf455%"}57573blabla " will result in {"asaf455%"}
> >>
> >> Any help will be highly appreciated.
> >>
> >> Thanks,
> >>
> >> __
> >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
>
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] A question on regular expression
Thanks Bert,
This works, but if in my text there are more than one patterns then
fails to generate desired result.
library(stringr)
str_extract_all(paste("ab{cd$ }ed", "ab{cad$ }ed", collapse = " "),
".*(\\{.*\\}).*")
This generates below -
[[1]]
[1] "ab{cd$ }ed ab{cad$ }ed"
I was expecting I would get a vector of length 2 with desired pattern.
Where did I make any mistake?
Thanks,
On Thu, Sep 12, 2019 at 10:29 PM Bert Gunter wrote:
>
> > sub(".*(\\{.*\\}).*", "\\1","ab{cd$ }ed")
> [1] "{cd$ }"
>
> Use ".+" instead of ".*" within the {} if you don't want to return empty {}'s.
>
> You might wish to use the stringr package for string matching and
> manipulation, as it provides a more user friendly and consistent interface to
> these tasks.
>
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along and
> sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>
> On Thu, Sep 12, 2019 at 9:31 AM Christofer Bogaso
> wrote:
>>
>> Hi,
>>
>> I am wondering on what is the correct way to select a pattern which goes as -
>>
>> {"(any character with any length)"}
>>
>> The expressions " {" " and " "} " both are included in the pattern.
>>
>> For example, the lookup of the above pattern in the text "
>> {"asaf455%"}57573blabla " will result in {"asaf455%"}
>>
>> Any help will be highly appreciated.
>>
>> Thanks,
>>
>> __
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] A question on regular expression
> sub(".*(\\{.*\\}).*", "\\1","ab{cd$ }ed")
[1] "{cd$ }"
Use ".+" instead of ".*" within the {} if you don't want to return empty
{}'s.
You might wish to use the stringr package for string matching and
manipulation, as it provides a more user friendly and consistent interface
to these tasks.
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Thu, Sep 12, 2019 at 9:31 AM Christofer Bogaso <
bogaso.christo...@gmail.com> wrote:
> Hi,
>
> I am wondering on what is the correct way to select a pattern which goes
> as -
>
> {"(any character with any length)"}
>
> The expressions " {" " and " "} " both are included in the pattern.
>
> For example, the lookup of the above pattern in the text "
> {"asaf455%"}57573blabla " will result in {"asaf455%"}
>
> Any help will be highly appreciated.
>
> Thanks,
>
> __
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] A question on regular expression
Hi,
I am wondering on what is the correct way to select a pattern which goes as -
{"(any character with any length)"}
The expressions " {" " and " "} " both are included in the pattern.
For example, the lookup of the above pattern in the text "
{"asaf455%"}57573blabla " will result in {"asaf455%"}
Any help will be highly appreciated.
Thanks,
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
