Omar André Gonzáles Díaz
2015-Oct-24 21:26 UTC
[R] regex not working for some entries in for loop
I'm using some regex in a for loop to check for some values in column
"source", and put a result in column "fuente".
I need some advice on this topics:
-Making the regex parts work, I've tasted them in regexpal.com and they
work, but not in R.
-Making the code (for loop) more efficient, more clear to read.
Cases: - "buy-cheap-online.info", regex: ".*buy.*".
- "guardlink.org", regex: ".*guardlink.*".
It is not
detected neither.
- "googleads.g.doubleclick.net", regex:
"googleads[.]g[.]doubleclick[.]net".
The data is a txt attached in this email.
R Code:
for (i in 1:nrow(sesionesxfuente)) {
organic <- grepl("start.iminent.com|websearch.com|
crawler.com|allmyweb.com",sesionesxfuente$source[i],
ignore.case = T)
adwords <- grepl("cpc|ccp",sesionesxfuente$source[i],
ignore.case T)
referral <- grepl(".*google\\.com\\.pe.*|.*google\\.co\\.ve\\.*|
.*google\\.com\\.br.*|.*google\\.com\\.bo\\.*|
.*google\\.com\\.ar.*|.*google\\.com.*",
sesionesxfuente$source[i],
ignore.case = T)
spam <- grepl("site.*|.*event.*|.*free.*|.*theguardlan.*|
.*guardlink.*|.*torture.*|.*forum.*|
.*buy.*|.*share.*|.*buttons.*|
.*pyme\\.lavoztx\\.com\\.*|.*amezon.*|
computrabajo.com.pe|.*porn.*|quality",
sesionesxfuente$source[i],
ignore.case = T)
adsense <- grepl("tpc.googlesyndication.com|
googleads[.]g[.]doubleclick[.]net",sesionesxfuente$source[i], ignore.case
= T)
redes.sociales <- grepl("facebook.com|
twitter.com",sesionesxfuente$source[i],
ignore.case = T)
if (sesionesxfuente$source[i] == "(direct)") {
sesionesxfuente$fuente[i] <- "directo"
}
else if (sesionesxfuente$medium[i] == "organic" |
organic) {
sesionesxfuente$fuente[i] <- "organico"
}
else if (sesionesxfuente$source[i] == "google"
& adwords) {
sesionesxfuente$fuente[i] <- "adwords"
}
else if (referral) {
sesionesxfuente$fuente[i] <- "referencias"
}
else if (adsense) {
sesionesxfuente$fuente[i] <- "adsense"
}
else if (redes.sociales) {
sesionesxfuente$fuente[i] <- "redes sociales"
}
else if (spam) {
sesionesxfuente$fuente[i] <- "spam"
}
else {
sesionesxfuente$fuente[i] <- sesionesxfuente$fuente[i]
}
}
Thanks.
-------------- next part --------------
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source = c("(direct)", "(direct)", "(direct)",
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"adsense", "spam", "organico",
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"organico", "organico", NA, NA, "spam",
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"organico", NA, "directo", "organico",
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"organico", "directo",
"redes sociales", "organico", "referencias",
"directo", "organico",
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"organico", "organico",
"organico", "directo", "organico",
"organico", "directo",
"organico", "organico", "redes sociales",
"organico")), .Names = c("date",
"source", "medium", "users", "sessions",
"fuente"), row.names = c(NA,
-617L), profile.info = structure(list(profile.id = "88090999",
account.id = "52266738", webproperty.id =
"UA-52266738-1",
internal.webproperty.id = "84690154", profile.name = "Chayan
Web Official",
table.id = "ga:88090999"), .Names = c("profile.id",
"account.id",
"webproperty.id", "internal.webproperty.id",
"profile.name",
"table.id")), query = structure(list(start.date =
"2014-07-04",
end.date = "today", profile.id = "ga:88090999",
dimensions = "ga:date,ga:source,ga:medium",
metrics = "ga:users,ga:sessions", start.index = 1L, max.results =
10000L), .Names = c("start.date",
"end.date", "profile.id", "dimensions",
"metrics", "start.index",
"max.results")), class = "data.frame")
> From: Omar Andr? Gonz?les D?az > Subject: [R] regex not working for some entries in for loop > > I'm using some regex in a for loop to check for some values in column "source", > and put a result in column "fuente".Your regexes are on multiple lines and include whitespace and linefeeds. For example you are not testing for " .*forum.*|.*buy.*"; you are testing for " .*forum.*| .*buy.*" (which among other things includes a \n) Don?t do that. Keep it to one line with no white space. if you must have line breaks in the code, form the pattern using paste, as in pat1 <- paste(c("site.*", ".*event.*", ".*free.*", ".*theguardlan.*", ".*guardlink.*", ".*torture.*", ".*forum.*", ".*buy.*", ".*share.*", ".*buttons.*", ".*pyme\\.lavoztx\\.com\\.*", ".*amezon.*", "computrabajo.com.pe", ".*porn.*", "quality"), collapse="|") spam <- grepl(pat1, sf$source,ignore.case = T) Also, it's not immediately clear why you?re looping. grepl returns a vector of logicals; you have a vector of character strings. Consider replacing 'if' constructs with 'ifelse' - albeit a complicated ifelse() - and doing the whole thing without a loop. S Ellison ******************************************************************* This email and any attachments are confidential. Any use, copying or disclosure other than by the intended recipient is unauthorised. If you have received this message in error, please notify the sender immediately via +44(0)20 8943 7000 or notify postmaster at lgcgroup.com and delete this message and any copies from your computer and network. LGC Limited. Registered in England 2991879. Registered office: Queens Road, Teddington, Middlesex, TW11 0LY, UK
Omar André Gonzáles Díaz
2015-Nov-08 04:42 UTC
[R] regex not working for some entries in for loop
Thanks S. Ellison.
Finally, Ihad some time to test it. Thanks for your clarification.
Just one more question:
You say:
Your regexes are on multiple lines and include whitespace and linefeeds.
For example you are not testing for
" .*forum.*|.*buy.*"; you are testing for
" .*forum.*|
.*buy.*"
But, the ".*", as far as I understand, means: any character, 0 or more
times. So I should cover the blank and break lines. May you explain this
further, this is not making click on my head.
2015-10-26 7:29 GMT-05:00 S Ellison <S.Ellison at lgcgroup.com>:
>
>
> > From: Omar Andr? Gonz?les D?az
> > Subject: [R] regex not working for some entries in for loop
> >
> > I'm using some regex in a for loop to check for some values in
column
> "source",
> > and put a result in column "fuente".
>
> Your regexes are on multiple lines and include whitespace and linefeeds.
> For example you are not testing for
> " .*forum.*|.*buy.*"; you are testing for
> " .*forum.*|
> .*buy.*"
> (which among other things includes a \n)
> Don?t do that. Keep it to one line with no white space.
> if you must have line breaks in the code, form the pattern using paste, as
> in
> pat1 <- paste(c("site.*", ".*event.*",
".*free.*", ".*theguardlan.*",
> ".*guardlink.*", ".*torture.*",
".*forum.*", ".*buy.*",
> ".*share.*", ".*buttons.*",
".*pyme\\.lavoztx\\.com\\.*",
> ".*amezon.*", "computrabajo.com.pe",
".*porn.*", "quality"),
> collapse="|")
>
> spam <- grepl(pat1, sf$source,ignore.case = T)
>
> Also, it's not immediately clear why you?re looping. grepl returns a
> vector of logicals; you have a vector of character strings. Consider
> replacing 'if' constructs with 'ifelse' - albeit a
complicated ifelse() -
> and doing the whole thing without a loop.
>
> S Ellison
>
>
> *******************************************************************
> This email and any attachments are confidential. Any u...{{dropped:17}}