using grep with multiple entries in r to find mathcing strings -

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i have searched question online seem find every answer one.

if have vector of strings:

dd <- c("sflxgrbfg_sprd_2011","sflxgrbfg_sprd2_2011","sflxgrbfg_sprd_2012")

and want find entires '2011' in string can use

ifiles <- dd[grep("2011",dd)]

how search entries combination of strings included, without using loop?

for example, find entries both '2011' , 'sprd' in string, in case return 

sflxgrbfg_sprd_2011

how can done? define variable

tomatch <- c('2011','sprd)

and loop through entries hoping there better solution?

note: make useful different strings. possible to determine entries have these strings without them being in order shown. example, 'sflxlgrbfg_2011_sprd'

if want find more 1 pattern, try indexing logical value rather number. way can create "and" condition, string both patterns extracted.

ifiles <- dd[grepl("2011",dd) & grepl("sprd_",dd)]

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