...
Further topics (see ?regexp in R):
character classes: e.g., POSIX names [:alnum:] [:alpha:] [:digit:] [:lower:] [:upper:] [:blank:] or sometimes shortcuts like
\w
or\s
enumerators: *, +, ?, [1,10], [2,]
capturing matches and backreferencing
...
Further topics (see ?regexp in R):
character classes: e.g., POSIX names [:alnum:] [:alpha:] [:digit:] [:lower:] [:upper:] [:blank:] or sometimes shortcuts like \w
or \s
enumerators: *, +, ?, [1,10], [2,]
capturing matches and backreferencing