grapes-begins_with-grapes: check whether a character string begins with a string

In grebbel/formr_test: formr survey framework

Description

Escapes any special RegExp characters in the search term. A way to check whether the search term (e.g. a variable name) is the beginning. Just a simple shorthand so that inexperienced R users won't have to use somewhat complex functions such as grepl() and stringr::str_detect(). You can also use %starts_with%.

Usage

haystack %begins_with% needle

Arguments

haystack	string in which you search
needle	string to search for

Examples

"1, 3, 4" %begins_with% "1" # TRUE
"1, 3, 4" %begins_with% 1 # unlike str_detect casts all needles as characters
"1, 3, 4" %begins_with% "." # FALSE

grebbel/formr_test documentation built on May 17, 2019, 8:34 a.m.