Grep a 1 or 2 character number from a variable in R -

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i have 2 tables, grow , temp. grow details growing , nongrowing seasons each area i'm concerned (these static), while temp details average temperature each month of wide range of years (these columns) same areas. i'm trying identify average temperature each year growing , nongrowing seasons, i've run problem how pick columns - i'm using grep, can't figure out how account two-digit months!

at point i've isolated each column of years, , have vector of column names single year - "tmp_2001_1" "tmp_2001_2" "tmp_2001_3" ... "tmp_2001_11" "tmp_2001_12". have, stored in pair of variables, start , end of growing season, stored integers representing months: start <- number between 1 , 12, end <- number between 1 , 12. can't figure out how grep identify growing season when start or end has 2 digits. have works case of them both being 1 digit numbers:

grow_months <- grep(paste('tmp_','2001','_','[',start,'-',end,']',sep = ''), vector_of_column_names)

how can expand account cases start or end double digit?

as gregor suggests,

strings = paste0("tmp_2001_",c(1:20,100)) start = 9 end = 12 ii = sapply(strsplit(strings,'_'), function(x)x[3]%in%start:end) strings[ii]

or using easy regex try

ii = grep(paste(paste0('_(',start:end,')$'),collapse='|'), strings) strings[ii]

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