Re: [R] Discovering patterns in textual strings
You seem to be using semantics to make your choices, not merely rules-based
patterns.
But in any case, I cannot help. Perhaps someone else with more experience
at this sort of thing or who is smarter can.
-- Bert
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 Mon, May 7, 2018 at 2:02 PM, Jeff Reichman <reichm...@sbcglobal.net>
wrote:
> Bert
>
>
>
> Here are some examples of the type of text strings I’m dealing with:
>
>
>
> ??.??.???
>
> ??.??.??
>
> ?Torrent? Pro - Torrent App
>
> ?Torrent?-Torrent Downloader
>
> 1 Pic 8 Words - Syllables
>
> 1 Pic 8 Words - Syllables
>
> 27043_Spanish songs for children
>
> 28.android.com.alpha.horoscope
>
> 28.android.com.bravo.horoscope
>
> 28.Card Game - Offline
>
> 28.card Game Multiplayer
>
> 37045_Spanish songs for children
>
> 7 Minute Workout for Weight Loss: Daily Cardio App
>
> 7 Minute Workout Plus
>
> 7 Minute Workout_SMA_IA_$2.25_com.popularapp.sevenmins_CD_
> Android_MEDIUMRECTANGLE_300x250_IAB7
>
> 7 Nights at Pizza House - 2
>
> 7 Nights at Pizza House 3D
>
> com.zombodroid
>
> com.zombodroid.battle
>
> com.zombodroid.memegenerator
>
> com.zone.talking.pet
>
> com.zone.yinshidaquan
>
> Disney Kingdom
>
> Disney Kingdom_Android
>
> Evite
>
> Evite Invitations
>
> Evite IOS_Evite_IOS_320x50
>
> Excavator Simulator 3D:Sand
>
> Excavator Snow Plow Loader Truck
>
> Flippy Knife
>
> Flippy Knife - 654567
>
> fliptech.iowafmworld
>
> fliptech.serbiafmworld
>
> Floor is lava!
>
> Floor is lava: Escape
>
> Go_Launcher
>
> Go_Launcher_Lite
>
> myyearbook Android
>
> myyearbook.com-MeetMe_Android_300x250_UK
>
>
>
> hoping to obtain something like ….
>
>
>
> ??.??
>
> Torrent
>
> 1 Pic 8 Words
>
> 7 Minute Workout
>
> 7 Nights at Pizza House
>
> com.zombodroid
>
> com.zone
>
> Disney Kingdom
>
> Flippy Knife
>
> fliptech
>
> Floor is lava
>
> Go_Launcher
>
> myyearbook
>
>
>
>
>
>
>
> *From:* Bert Gunter <bgunter.4...@gmail.com>
> *Sent:* Saturday, May 5, 2018 2:14 AM
> *To:* reichm...@sbcglobal.net
> *Cc:* R-help <r-help@r-project.org>
> *Subject:* Re: [R] Discovering patterns in textual strings
>
>
>
> I am still somewhat confused by your specifications, but others may not
> be. Part of my confusion stems from your failure to provide a reproducible
> example (see e.g. the posting guide linked below). For example, I cannot
> tell from your text whether the Abc and Bce strings contain one or more
> spaces at the end. I shall assume they may but need not.
>
> Anyway, here is a reproducible example and solution that assumes that the
> substrings/patterns of interest to you occur at the beginning of the
> strings and may or may not be followed by one of "." "_" or " "(space) and
> then possibly further text which should be ignored. Assuming that you are
> familiar with regular expressions, maybe this will help to get you started
> even if I have misunderstood your specifications. If you aren't familiar
> with regex's, maybe the stringr package may provide a gentler interface
> than using R's raw regex functionality. Or maybe someone else can suggest a
> better approach (which is another reason why you should reply to the list,
> not just me).
>
> z <- c("abc",
>"abc_def",
>"abc.def",
>"abc def",
>"abcd_ef",
>"abcd",
>"e","f")
>
> pats <- unique(sub("^(.+)[. _]+.*", "\\1", z))
>
> ## gives:
> > pats
> [1] "abc" "abcd" "e""f"
>
>
>
> This gives you the four separate patterns that you could then use to group
> your records, perhaps by:
>
> > lapply(pats,function(x)grep(paste0("^", x,"([_. ]|$)"), z))
> [[1]]
> [1] 1 2 3 4
>
> [[2]]
> [1] 5 6
>
> [[3]]
> [1] 7
>
> [[4]]
> [1] 8
>
>
>
> That is, indices 1-4 in z are the first group; 5 and 6 are the second; etc.
>
>
> Cheers,
> Bert
>
>
> 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 Fri, May 4, 2018 at 9:00 PM, Jeff
Re: [R] Discovering patterns in textual strings
Bert
Here are some examples of the type of text strings I’m dealing with:
??.??.???
??.??.??
?Torrent? Pro - Torrent App
?Torrent?-Torrent Downloader
1 Pic 8 Words - Syllables
1 Pic 8 Words - Syllables
27043_Spanish songs for children
28.android.com.alpha.horoscope
28.android.com.bravo.horoscope
28.Card Game - Offline
28.card Game Multiplayer
37045_Spanish songs for children
7 Minute Workout for Weight Loss: Daily Cardio App
7 Minute Workout Plus
7 Minute
Workout_SMA_IA_$2.25_com.popularapp.sevenmins_CD_Android_MEDIUMRECTANGLE_300x250_IAB7
7 Nights at Pizza House - 2
7 Nights at Pizza House 3D
com.zombodroid
com.zombodroid.battle
com.zombodroid.memegenerator
com.zone.talking.pet
com.zone.yinshidaquan
Disney Kingdom
Disney Kingdom_Android
Evite
Evite Invitations
Evite IOS_Evite_IOS_320x50
Excavator Simulator 3D:Sand
Excavator Snow Plow Loader Truck
Flippy Knife
Flippy Knife - 654567
fliptech.iowafmworld
fliptech.serbiafmworld
Floor is lava!
Floor is lava: Escape
Go_Launcher
Go_Launcher_Lite
myyearbook Android
myyearbook.com-MeetMe_Android_300x250_UK
hoping to obtain something like ….
??.??
Torrent
1 Pic 8 Words
7 Minute Workout
7 Nights at Pizza House
com.zombodroid
com.zone
Disney Kingdom
Flippy Knife
fliptech
Floor is lava
Go_Launcher
myyearbook
From: Bert Gunter <bgunter.4...@gmail.com>
Sent: Saturday, May 5, 2018 2:14 AM
To: reichm...@sbcglobal.net
Cc: R-help <r-help@r-project.org>
Subject: Re: [R] Discovering patterns in textual strings
I am still somewhat confused by your specifications, but others may not be.
Part of my confusion stems from your failure to provide a reproducible example
(see e.g. the posting guide linked below). For example, I cannot tell from
your text whether the Abc and Bce strings contain one or more spaces at the
end. I shall assume they may but need not.
Anyway, here is a reproducible example and solution that assumes that the
substrings/patterns of interest to you occur at the beginning of the strings
and may or may not be followed by one of "." "_" or " "(space) and then
possibly further text which should be ignored. Assuming that you are familiar
with regular expressions, maybe this will help to get you started even if I
have misunderstood your specifications. If you aren't familiar with regex's,
maybe the stringr package may provide a gentler interface than using R's raw
regex functionality. Or maybe someone else can suggest a better approach (which
is another reason why you should reply to the list, not just me).
z <- c("abc",
"abc_def",
"abc.def",
"abc def",
"abcd_ef",
"abcd",
"e","f")
pats <- unique(sub("^(.+)[. _]+.*", "\\1 ", z))
## gives:
> pats
[1] "abc" "abcd" "e""f"
This gives you the four separate patterns that you could then use to group your
records, perhaps by:
> lapply(pats,function(x)grep(paste0("^", x,"([_. ]|$)"), z))
[[1]]
[1] 1 2 3 4
[[2]]
[1] 5 6
[[3]]
[1] 7
[[4]]
[1] 8
That is, indices 1-4 in z are the first group; 5 and 6 are the second; etc.
Cheers,
Bert
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 Fri, May 4, 2018 at 9:00 PM, Jeff Reichman <reichm...@sbcglobal.net
<mailto:reichm...@sbcglobal.net> > wrote:
Bert
Thank you for the link. Figured there might be something
Regarding your questions
This is from a large 53 Billion records. The column in question are AdNames
(Real Time Bidding data)
#1. Generally yes, but not always
#2 Separators could be underscores (_) or dots (.) as in 1.2.3_ABC .
#3 Yes. So there could be Abc 123 could be a matching string
This would not be considered a match ...
abc_something
this.is_a long stringwithabcinthemiddle
The sequence(s) are always are at the beginning (or so it appears). Out of the
54 billion records I am able to pull (SparkR sql) 948,679 unique strings. It
is from these unique strings that I (if possible) want to identify the "key"
strings.
1. Abc_1232.niok7j9hd
2. Abc
3. Abc.2#348hfk2.njilo
4. Abc.2
5. Abc.7
6. BAdfr_kajdhf98#kjsdh
7. BAdrf_gofer
948679
So I may have a thousand individuals strings all of which have Abc as a common
string, or Badrf. So I am looking to pull "Abc," "BAdrf", etc. So then I can
go back and restructure the data to show that any record with
Abc_1232.niok7j9hd if part of the Abc "Group," or Family ???
Does that help
Jeff
-Original Message-
From: Bert Gunter <bgunter.4...@gmail.com <mailto:bgunt
Re: [R] Discovering patterns in textual strings
Jeff:
The previous solution I sent you was hugely inefficient and frankly kind of
stupid. Here is a much better and simpler solution.
> z <- c("abc",
"abc_def",
"abc.def",
"abc def",
"abcd_ef",
"abcd",
"e","f")
## Create vector of patterns of same length as z, many of which are repeated
> pats <- sub("^(.+)[. _].*","\\1",z)
## Now can use tapply() to get indices if desired
## Note that the patterns label the groups
> tapply(seq_along(z),pats,I)
$abc
[1] 1 2 3 4
$abcd
[1] 5 6
$e
[1] 7
$f
[1] 8
No need to reply.
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Sat, May 5, 2018 at 12:14 AM, Bert Gunter <bgunter.4...@gmail.com> wrote:
> "Does that help?"
>
> No. I am not your private consultant. You need to reply to the list, which
> I have cc'ed here, not just me.
>
> I am still somewhat confused by your specifications, but others may not
> be. Part of my confusion stems from your failure to provide a reproducible
> example (see e.g. the posting guide linked below). For example, I cannot
> tell from your text whether the Abc and Bce strings contain one or more
> spaces at the end. I shall assume they may but need not.
>
> Anyway, here is a reproducible example and solution that assumes that the
> substrings/patterns of interest to you occur at the beginning of the
> strings and may or may not be followed by one of "." "_" or " "(space) and
> then possibly further text which should be ignored. Assuming that you are
> familiar with regular expressions, maybe this will help to get you started
> even if I have misunderstood your specifications. If you aren't familiar
> with regex's, maybe the stringr package may provide a gentler interface
> than using R's raw regex functionality. Or maybe someone else can suggest a
> better approach (which is another reason why you should reply to the list,
> not just me).
>
> z <- c("abc",
>"abc_def",
>"abc.def",
>"abc def",
>"abcd_ef",
>"abcd",
>"e","f")
>
> pats <- unique(sub("^(.+)[. _]+.*", "\\1", z))
> ## gives:
> > pats
> [1] "abc" "abcd" "e""f"
>
>
> This gives you the four separate patterns that you could then use to group
> your records, perhaps by:
>
> > lapply(pats,function(x)grep(paste0("^", x,"([_. ]|$)"), z))
> [[1]]
> [1] 1 2 3 4
>
> [[2]]
> [1] 5 6
>
> [[3]]
> [1] 7
>
> [[4]]
> [1] 8
>
> That is, indices 1-4 in z are the first group; 5 and 6 are the second; etc.
>
>
>
> Cheers,
> Bert
>
> 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 Fri, May 4, 2018 at 9:00 PM, Jeff Reichman <reichm...@sbcglobal.net>
> wrote:
>
>> Bert
>>
>> Thank you for the link. Figured there might be something
>>
>> Regarding your questions
>>
>> This is from a large 53 Billion records. The column in question are
>> AdNames (Real Time Bidding data)
>>
>> #1. Generally yes, but not always
>>
>> #2 Separators could be underscores (_) or dots (.) as in 1.2.3_ABC ..
>>
>> #3 Yes. So there could be Abc 123 could be a matching string
>>
>> This would not be considered a match ...
>> abc_something
>> this.is_a long stringwithabcinthemiddle
>>
>> The sequence(s) are always are at the beginning (or so it appears). Out
>> of the 54 billion records I am able to pull (SparkR sql) 948,679 unique
>> strings. It is from these unique strings that I (if possible) want to
>> identify the "key" strings.
>>
>> 1. Abc_1232.niok7j9hd
>> 2. Abc
>> 3. Abc.2#348hfk2.njilo
>> 4. Abc.2
>> 5. Abc.7
>> 6. BAdfr_kajdhf98#kjsdh
>> 7. BAdrf_gofer
>> 948679
>>
>>
>> So I may have a thousand individuals strings all of which have Abc as a
>> common string, or Badrf. So I am looking to pull "Abc," "BAdrf", etc. So
>> then I can go back and restructure the data to show that any record with
>> Abc_1232.niok7j9hd if part of the Abc "Group," or Family ???
>>
&
Re: [R] Discovering patterns in textual strings
"Does that help?"
No. I am not your private consultant. You need to reply to the list, which
I have cc'ed here, not just me.
I am still somewhat confused by your specifications, but others may not be.
Part of my confusion stems from your failure to provide a reproducible
example (see e.g. the posting guide linked below). For example, I cannot
tell from your text whether the Abc and Bce strings contain one or more
spaces at the end. I shall assume they may but need not.
Anyway, here is a reproducible example and solution that assumes that the
substrings/patterns of interest to you occur at the beginning of the
strings and may or may not be followed by one of "." "_" or " "(space) and
then possibly further text which should be ignored. Assuming that you are
familiar with regular expressions, maybe this will help to get you started
even if I have misunderstood your specifications. If you aren't familiar
with regex's, maybe the stringr package may provide a gentler interface
than using R's raw regex functionality. Or maybe someone else can suggest a
better approach (which is another reason why you should reply to the list,
not just me).
z <- c("abc",
"abc_def",
"abc.def",
"abc def",
"abcd_ef",
"abcd",
"e","f")
pats <- unique(sub("^(.+)[. _]+.*", "\\1", z))
## gives:
> pats
[1] "abc" "abcd" "e""f"
This gives you the four separate patterns that you could then use to group
your records, perhaps by:
> lapply(pats,function(x)grep(paste0("^", x,"([_. ]|$)"), z))
[[1]]
[1] 1 2 3 4
[[2]]
[1] 5 6
[[3]]
[1] 7
[[4]]
[1] 8
That is, indices 1-4 in z are the first group; 5 and 6 are the second; etc.
Cheers,
Bert
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 Fri, May 4, 2018 at 9:00 PM, Jeff Reichman <reichm...@sbcglobal.net>
wrote:
> Bert
>
> Thank you for the link. Figured there might be something
>
> Regarding your questions
>
> This is from a large 53 Billion records. The column in question are
> AdNames (Real Time Bidding data)
>
> #1. Generally yes, but not always
>
> #2 Separators could be underscores (_) or dots (.) as in 1.2.3_ABC ..
>
> #3 Yes. So there could be Abc 123 could be a matching string
>
> This would not be considered a match ...
> abc_something
> this.is_a long stringwithabcinthemiddle
>
> The sequence(s) are always are at the beginning (or so it appears). Out
> of the 54 billion records I am able to pull (SparkR sql) 948,679 unique
> strings. It is from these unique strings that I (if possible) want to
> identify the "key" strings.
>
> 1. Abc_1232.niok7j9hd
> 2. Abc
> 3. Abc.2#348hfk2.njilo
> 4. Abc.2
> 5. Abc.7
> 6. BAdfr_kajdhf98#kjsdh
> 7. BAdrf_gofer
> 948679
>
>
> So I may have a thousand individuals strings all of which have Abc as a
> common string, or Badrf. So I am looking to pull "Abc," "BAdrf", etc. So
> then I can go back and restructure the data to show that any record with
> Abc_1232.niok7j9hd if part of the Abc "Group," or Family ???
>
> Does that help
>
> Jeff
>
> -Original Message-
> From: Bert Gunter <bgunter.4...@gmail.com>
> Sent: Friday, May 4, 2018 5:41 PM
> To: reichm...@sbcglobal.net
> Cc: R-help <R-help@r-project.org>
> Subject: Re: [R] Discovering patterns in textual strings
>
> The answer is, of course, using regular expressions and/or libraries
> therefor. However, I do not think you have defined your problem
> sufficiently. Some questions I have:
>
> 1. Do possible patterns to be matched always appear at the beginning of
> your strings?
>
> 2. Always together between specified separators ("_" in your example); or
> one of several specified separators; or otherwise?
>
> 3. Do spaces or other nonprinting characters occur in your strings?
>
> e.g. would
>
> abc_something
> this.is_a long stringwithabcinthemiddle
>
> be considered matching?
> There are undoubtedly other possibilities that I've missed.
>
>
>
> You may also find it useful to check this "task view" out for
> possibilities:
> https://cran.r-project.org/web/views/NaturalLanguageProcessing.html
>
> Cheers,
> Bert
>
>
> 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"
Re: [R] Discovering patterns in textual strings
The answer is, of course, using regular expressions and/or libraries
therefor. However, I do not think you have defined your problem
sufficiently. Some questions I have:
1. Do possible patterns to be matched always appear at the beginning
of your strings?
2. Always together between specified separators ("_" in your
example); or one of several specified separators; or otherwise?
3. Do spaces or other nonprinting characters occur in your strings?
e.g. would
abc_something
this.is_a long stringwithabcinthemiddle
be considered matching?
There are undoubtedly other possibilities that I've missed.
You may also find it useful to check this "task view" out for possibilities:
https://cran.r-project.org/web/views/NaturalLanguageProcessing.html
Cheers,
Bert
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 Fri, May 4, 2018 at 3:25 PM, Jeff Reichman wrote:
> R Help Forum
>
>
>
> Is there a R library (or a way) that I can extract unique character strings,
> or repeating patterns in textual strings. Say for example I have the
> following records:
>
>
>
> Abc_1234_kjhksh_276
>
> Abc
>
> Abc_1234_lakdofyo_324
>
> Bce_876_skdhk_*&^%*&
>
> Bce
>
> Bce_454
>
>
>
> And I would like to see the following results
>
> Abc
>
> Abc_1234
>
> Bce
>
>
>
>
>
> Jeff Reichman
>
>
> [[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-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] Discovering patterns in textual strings
R Help Forum Is there a R library (or a way) that I can extract unique character strings, or repeating patterns in textual strings. Say for example I have the following records: Abc_1234_kjhksh_276 Abc Abc_1234_lakdofyo_324 Bce_876_skdhk_*&^%*& Bce Bce_454 And I would like to see the following results Abc Abc_1234 Bce Jeff Reichman [[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.
