R help - Sep 2016 - separate commands by semicolon

Dear R-helpers,

When parsing a text, I would like to separate commands written on the same
line, by a semicolon.
Something like:

x <- "foo <- '3;4'; bar <- \"don't ; use
semicolons\""

Ideally, that would translate to these two commands in a character vector
of length 2:
foo <- '3;4'
bar <- "don't ; use semicolons"

It's probably a regexp magic, but I just can't find it.

Any hint is highly appreciated,
Adrian

-- 
Adrian Dusa
University of Bucharest
Romanian Social Data Archive
Soseaua Panduri nr.90
050663 Bucharest sector 5
Romania

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The most reliable way to split such lines is with parse(text=x).
Regular expressions don't do well with context-free grammars.

Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Thu, Sep 15, 2016 at 12:08 PM, Adrian Du?a <dusa.adrian at unibuc.ro>
wrote:
> Dear R-helpers,
>
> When parsing a text, I would like to separate commands written on the same
> line, by a semicolon.
> Something like:
>
> x <- "foo <- '3;4'; bar <- \"don't ; use
semicolons\""
>
> Ideally, that would translate to these two commands in a character vector
> of length 2:
> foo <- '3;4'
> bar <- "don't ; use semicolons"
>
> It's probably a regexp magic, but I just can't find it.
>
> Any hint is highly appreciated,
> Adrian
>
> --
> Adrian Dusa
> University of Bucharest
> Romanian Social Data Archive
> Soseaua Panduri nr.90
> 050663 Bucharest sector 5
> Romania
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
>
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On Thu, Sep 15, 2016 at 10:28 PM, William Dunlap <wdunlap at tibco.com>
wrote:
> The most reliable way to split such lines is with parse(text=x).
> Regular expressions don't do well with context-free grammars.
>
Oh, that's right of course.
> as.character(parse(text = x))
[1] "foo <- \"3;4\""                    "bar <-
\"don't ; use semicolons\""

That was simple enough, thanks very much,
Adrian

-- 
Adrian Dusa
University of Bucharest
Romanian Social Data Archive
Soseaua Panduri nr.90
050663 Bucharest sector 5
Romania

	[[alternative HTML version deleted]]