[R] matching period with perl regular expression

Dieter Menne dieter.menne at menne-biomed.de
Thu May 14 10:40:43 CEST 2009

Gabor Grothendieck <ggrothendieck <at> gmail.com> writes:

> R interprets backslash to give special meaning to the next character, i.e.
> it strips off the backslash and send the following character to gsub
> possibly reinterpreting it specially (for example \n is newline).  Thus
> a backslash will never get to gsub unless you use a double backslash.

To quote Peter Dalgaard:

"The generic rule for backslashes is that you need twice as many as you thought"

Only make sure that you have the right stopping rule for recursive evaluation of


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