> From: Omar André Gonzáles Díaz
> 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
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