\name{pm.abstGrep}
\alias{pm.abstGrep}
\title{An interface to grep for PubMed abstracts.}
\description{
  A user friendly interface to the functionality provided by
 \code{pubmed}. 
}
\usage{
pm.abstGrep(pattern, absts, ...)
}
\arguments{
  \item{pattern}{A pattern for the call to \code{grep}.}
  \item{absts}{A list containing abstracts downloaded using \code{pubmed} or
  equivalent.}
  \item{\dots}{Extra arguments passed to \code{grep}.}
}
\details{
  The \code{absts} are a list of PubMed XML objects that have been downloaded 
  and parsed. This function lets the user quickly search the abstracts
  for any regular expression. The returned value is a logical vector
  indicating which of the abstracts contain the regular expression.
}
\value{
 The returned value is a logical vector
  indicating which of the abstracts contain the regular expression.
}
\author{Robert Gentleman}
\seealso{\code{\link{pm.getabst}}, \code{\link{pm.titles}}}
\examples{
  library("hgu95av2.db")
  hoxa9 <- "37809_at"
  absts <- pm.getabst(hoxa9, "hgu95av2")
  pm.abstGrep("NUP98", absts[[1]])
  pm.abstGrep("apoptosis", absts[[1]])
}
\keyword{manip}