x is a string :
x="alt=\"white\"/>"
I want to extract "white" in one regex in R
I try
gsub(pattern ="[(^[:alpha:])|(alt)]" ,replacement ="" ,x =x)
But obviously, it does not work. Any ideas?
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Sandipan Dey
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hans glick
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1Are you [`regex`ing HTML](http://stackoverflow.com/questions/1732348)?? bad idea. – MichaelChirico Oct 03 '16 at 16:57
2 Answers
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Is this what you're looking for?
some_vector <- c("alt=\"white\"/>", "alt=\"black\"/>")
colours <- gsub('(alt)="([^"]+)"', '\\1=""', some_vector)
colours
# [1] "alt=\"\"/>" "alt=\"\"/>"
Generally, you should go for some parser instead.
Jan
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ok thanks for ur answer. By parser, do you mean something like strsplit? – hans glick Oct 03 '16 at 17:23
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Try this if you are interested in some pattern appearing within the quotes only:
gsub(".*\"(.*)\".*", "\\1", x)
#[1] "white"
Sandipan Dey
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