r - grep in ifelse for a vector of values -


i have following dataframe: 

data <- data.frame(mobile_number = c(           "999/277-135",                   "075-788-476",                   "078-388-607",                   "077/969-557",                   "076/423-130"))

and want create boolean variable if first 7 characters in string match 1 of values in following vector:

list_values <- c("071", "072", "073", "074", "075", "076", "077", "078", "079")

i can pull values following grep code:

grep(paste(list_values,collapse="|"),                       data$mobile_number, value=true))

but i'm not sure how put in ifelse statement, , how text on first 7 elements of string.

anyone?

we can use substr substring of 1st 7 chararacters, apply grepl on , convert binary (if needed) using as.integer

as.integer(grepl(paste(list_values,collapse="|"), substr(data[[1]], 1, 7)))

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