regex - Wildcard character -


i've dataframe, , i'm trying select columns properties in name.

one example (of many) want select columns called "t*_b**" * wildcard character. select columns names t1_b2, t2_b2, t3_b2 , t4_b2 (as several others t1_b13, t2_b13 etc.).

if there such wildcard character use, know use following command:

grep("t*_b", names(df))

as opposed doing:

c(grep("t1_b", names(df)), grep("t2_b", names(df)), grep("t3_b", names(df)), grep("t4_b", names(df)))

which messier , harder read.

update: first comment has resolved issue. don't have real need further input, help!

the wildcard 'character' in regular expressions .. such, 

grep("t._b", names(df))

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