[R] Replace multiple subexpressions at once?
murdoch@dunc@n @end|ng |rom gm@||@com
Tue Oct 25 12:28:33 CEST 2022
An R regular expression pattern can contain parenthesized
subexpressions, and those can be used later in the same pattern, or in
the replacement in sub() and gsub(). What I'd like to do is match
several subexpressions and replace all of them.
For example, I might have a string like
s <- "<div data-pos=\"Untitled.knit.md using 12:1-13:1\">"
and I can use the regular expression
regexp <- ".*<[^>]+ data-pos=\"([^\"]*)@([[:digit:]]+):.*"
to match the whole thing, with \\1 matching "Untitled.knit.md" and \\2
matching "12". I'd like to replace the first with "newname" and the
second with "newnumber", so the string ends up looking like
s <- "<div data-pos=\"newname using newnumber:1-13:1\">"
I could write a function to do this using regexec() and two calls to
`substring<-`(), but I'm hoping someone has already done that. Any
P.S. I'm going to be travelling for a couple of weeks, and so may not
respond right away.
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