Use the new stringr package which wraps all the existing regular expression operates in a consistent syntax and adds a few that are missing:
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| Regex. (source: blog.cmstutorials.org) |
R> library(stringr)
R> str_locate("aaa12xxx", "[0-9]+")
# start end
# [1,] 4 5
R> str_extract("aaa12xxx", "[0-9]+")
# [1] "12"
or
R> gsub("[^0-9]", "", "aaa12xxxx")
# [1] "12"
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