[R] Need content_transformer() called by tm_map() to change non-letters to spaces

Jeff Newmiller jdnewmil at dcn.davis.CA.us
Fri Apr 24 06:09:59 CEST 2015

Regex "[^a-zA-Z]" reads as "not a letter". 
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Sent from my phone. Please excuse my brevity.

On April 23, 2015 1:10:41 PM PDT, Mike <mikehall at y7mail.com> wrote:
>In the following code, any characters matching  "/|@| \\|") will be
>changed to a space. 
>> library(tm)
>> toSpace <- content_transformer(function(x, pattern) gsub(pattern, "
>", x))
>> docs <- tm_map(docs, toSpace, "/|@| \\|")
>What code would transform all non-letters to a space?  (What goes where
>the xxxxx's are.)It is very difficult to put all non-letters in a
>string...  So I'm doing the opposite of the above.
>> toSpace_2 <- content_transformer(function xxxxxxxxxxxxxxxxxxxxxxx))
>> docs <- tm_map(docs, toSpace_2, "abcdefghijklmnopqrstuvwxyz")
>This needs to be done by a content_transformer() function to maintain
>the integrity of docs.
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