使用R在语料库中搜索单词

Question

I am trying to search for strings of words in a corpus using R. Are disjunctive statements allowed in grep, eg, grep("a" or "b" or "c"...)? If so, once I have that subcorpus, how do I then refine it further to contain only those examples with at least two tokens of the original condition?

Answer 1

Yes, the vertical bar | works as an or-operator in grep . You can look up regular expressions in R by running ?regex .

So, to give an example:

grep("ape|bass|cat", c("monkey", "bass", "catfish"))
[1] 2 3

Also confer the documentation of grep , grepl , and that family of functions. The stringr package provide additional tools for handling text.