r remove everything before character code example

Example 1: r substitute string character until :

foo <- "TF_list_to_test10004/Nus_k0.345_t0.1_e0.1.adj:PKMYT1"

# Remove all before and up to ":":
gsub(".*:","",foo)

# Extract everything behind ":":
regmatches(foo,gregexpr("(?<=:).*",foo,perl=TRUE))

Example 2: r remove all string before : in r data frame

> x <- 'aabb.ccdd'
> sub('.*', '', x)
[1] ""
> sub('bb.*', '', x)
[1] "aa"
> sub('.*bb', '', x)
[1] ".ccdd"
> sub('\\..*', '', x)
[1] "aabb"
> sub('.*\\.', '', x)
[1] "ccdd"