bracketedStrings: Extract bracketed substrings.

In DAVIDQuery: Retrieval from the DAVID bioinformatics data resource into R

Description

Extract substrings that are bracketed by specified strings before and after.

Usage

bracketedStrings(s, before, after, verbose=FALSE, addNames=FALSE, drop.na=TRUE, warn.if.gt.1=TRUE)

Arguments

s	Vector of strings to search.
before	String to the left of the desired substring within s.
after	String to the right of the desired substring within s.
verbose	If TRUE, print the starting and ending index (or indices) of the desired substring(s).
addNames	If TRUE, and if s is a vector, set the names attribute of the return value to s.
drop.na	If TRUE, remove empty strings from the return value.
warn.if.gt.1	If TRUE, warn if a string has more than one pair of bracketed target strings.

Value

For a single input string s, the return value is the desired substring sandwiched between before and after. For a vector of inputs, list of outputs.

Author(s)

Roger Day

See Also

DAVIDQuery

Examples

 
bracketedStrings("quickbrownfox", "quick", "fox")
bracketedStrings(c("quickbrownfox", "quickredfox"), "quick", "fox", addNames=TRUE)
bracketedStrings("quickbrownfoxANDquickredfox", "quick", "fox")
bracketedStrings("quickbrownfoxANDquickredfox", "quick", "fox", warn.if.gt.1=FALSE)

DAVIDQuery documentation built on Sept. 12, 2016, 6:11 a.m.