Check if a String is a Substring — is

This function checks if a string is a substring of another.

Usage

is_substring(str1, str2)

Arguments

str1: The first string.
str2: The second string.

Value

TRUE if str1 is a substring of str2, otherwise returns FALSE.

Details

Unlike grepl() or stringr::str_detect(), is robust to invalid regular expressions. For instance, stringr::str_detect("abcd\[", "abcd\[ef") or stringr::str_detect("abcd]", "abcd]ef") failed to identify that the substrings.

Examples

is_substring("abc", "abcdef") # TRUE
#> [1] TRUE
is_substring("xyz", "abcdef") # FALSE
#> [1] FALSE
is_substring("abcd]", "abcd]ef") # TRUE
#> [1] TRUE
is_substring("abcd[", "abcd[ef") # TRUE
#> [1] TRUE