Patterns are regular expressions and will be used in functions like
base::grep() to extract R code and chunk options. The object
knit_patterns controls the patterns currently used; see the references
and examples for usage. All built-in patterns are available in the list
An object of class
list of length 6.
library(knitr) opat = knit_patterns$get() # old pattern list (to restore later) apats = all_patterns # a list of all built-in patterns str(apats) knit_patterns$set(apats[["rnw"]]) # set pattern list from apats knit_patterns$get(c("chunk.begin", "chunk.end", "inline.code")) # a customized pattern list; has to empty the original patterns first! knit_patterns$restore() # we may want to use this in an HTML document knit_patterns$set(list(chunk.begin = "<!--helloR\\s+(.*)", chunk.end = "^byeR-->")) str(knit_patterns$get()) knit_patterns$set(opat) # put the old patterns back
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