R variable string replacement in a data frame -

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i have dataframe looks follows:

df <- data.frame(one=c("s1_below_10", "s2_below_20"),                   two=c("s3_above_10","s4_above_10"))

i want replace strings number preceding first underscore. in other words, desired output is

1   3 2   4

i know how can perform replacement (the dataset large). help.

the basic gsub call like:

gsub("^.+?(\\d+)_.+","\\1",df$one) [1] "1" "2"

which lapply each column:

data.frame(lapply(df, gsub, pattern="^.+(\\d+)_.+",replacement= "\\1"))   1 2 1   1   3 2   2   4

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