# For R's PCRE and Perl engines REF1 REF2 # and so on, up to REF9 # For stringi/stringr's ICU engine ICU_REF1 ICU_REF2 # and so on, up to ICU_REF9 # Usage sub("a(b)c(d)", REF1 %R% REF2, "abcd") stringi::stri_replace_first_regex("abcd", "a(b)c(d)", ICU_REF1 %R% ICU_REF2)
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