R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  r e g e x p . R  Test suite
> ##
> 
> 
> regexp <- pracma::regexp
> regexpi <- pracma::regexpi
> regexprep <- pracma::regexprep
> refindall <- pracma::refindall
> 
> s <- "bat cat can car COAT court cut ct CAT-scan"
> pat <-  'c[aeiou]+t'
> identical(regexp(s, pat)$match,
+           c("cat", "cut"))
[1] TRUE
> identical(regexpi(s, pat)$match,
+           c("cat", "COAT", "cut", "CAT"))
[1] TRUE
> identical(regexp(s, pat, once = TRUE)$match,
+           c("cat"))
[1] TRUE
> identical(regexp(s, pat, ignorecase = TRUE, split = TRUE)$split,
+           c("bat ", " can car ", " court ", " ct ", "-scan"))
[1] TRUE
> 
> identical(regexprep(s, pat, '---'),
+           c("bat --- can car COAT court --- ct CAT-scan"))
[1] TRUE
> identical(regexprep(s, pat, '---', once = TRUE),
+           c("bat --- can car COAT court cut ct CAT-scan"))
[1] TRUE
> identical(regexprep(s, pat, '---', ignorecase = TRUE),
+           c("bat --- can car --- court --- ct ----scan"))
[1] TRUE
> 
> identical(refindall("AbababaBa", 'aba'), c(3, 5))
[1] TRUE
> identical(refindall("AbababaBa", 'aba', ignorecase = TRUE), c(1, 3, 5, 7))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.15    0.01    0.15