Globally search a Regular Expression and Print - grep

Code - R

~/code/R/

Ex 1

gsub("([ab])", "\\1_\\1_", "abc and ABC")

## [1] "a_a_b_b_c a_a_nd ABC"

Ex 2

## capitalizing
txt <- "a test of capitalizing"
gsub("(\\w)(\\w*)", "\\U\\1\\L\\2", txt, perl=TRUE)

## [1] "A Test Of Capitalizing"

gsub("\\b(\\w)",    "\\U\\1",       txt, perl=TRUE)

## [1] "A Test Of Capitalizing"