Searching functions using grep over multiple loaded packages in R

Question

Lets say I have package base, dplyr, data.table, tidyr etc. loaded using sapply().

 sapply(c         


        

Answer 1

Thanks to all. So here are Answers in 3 Versions to the question I posted with all the help here

Note: The priority was to search for a pattern over multiple loaded packages, you can search some other pattern instead of "is."

VERSION 1

 ## Get list of loaded packages into X 

 X <- grep('package:',search(),value=TRUE)  # Comment by danielson

 # Use grep to find functions with is. pattern over multiple loaded packages inside X

 sapply(X, function(X) {
 paste0(X, ":", grep("is\\.", ls(X),value=TRUE))
 })

VERSION 2

 ## Get list of loaded packages into X 

 X <- .packages()    # Comment by docendo discimus

 # Use grep to find functions with is. pattern over multiple loaded packages inside X

 sapply(X, function(X) {
 paste0(X, ":", grep("is\\.", ls(paste0("package:",X)),value=TRUE))
 })

VERSION 3 - Without grep() function

 ## Get list of loaded packages into X 

 X <- .packages()

 # find functions using `ls()` with is. pattern over multiple loaded packages inside X
 # Suggested by Rich Scriven Over Comments

 sapply(X, function(X) { 
 paste0(X,":",ls(paste0("package:",X), pattern = "is\\."))
 })