Nothing
# Returns extracted string with substitutions
re2_extract_replace(
"bunny@wunnies.pl",
"(.*)@([^.]*)",
"\\2!\\1"
)
# Case insensitive
re2_extract_replace(
"BUNNY@wunnies.pl",
re2_regexp("(b.*)@([^.]*)", case_sensitive = FALSE),
"\\2!\\1"
)
# Max submatch too large (1 match group, 2 submatches needed).
# Replacement fails and empty string is returned.
re2_extract_replace("foo", "f(o+)", "\\1\\2")
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