| delimMatch {tools} | R Documentation |
Delimited Pattern Matching
Description
Match delimited substrings in a character vector, with proper nesting.
Usage
delimMatch(x, delim = c("{", "\}"), syntax = "Rd")
Arguments
x |
a character vector. |
delim |
a character vector of length 2 giving the start and end delimiters. Currently, both must be single characters. Future versions might allow for arbitrary regular expressions. |
syntax |
currently, always the string ‘"Rd"’ indicating Rd syntax (i.e., ‘%’ starts a comment extending till the end of the line, and ‘\’ escapes). Future versions might know about other syntaxes, perhaps via “syntax tables” allowing to flexibly specify comment, escape, and quote characters. |
Value
An integer vector of the same length as x giving the starting
position of the first match, or -1 if there is none, with
attribute "match.length" giving the length of the matched text
(or -1 for no match).
See Also
regexpr for “simple” pattern matching.
Examples
x <- c("\{foo\}", "function(bar)")
delimMatch(x)
delimMatch(x, c("(", ")"))