`str index-of` for strings

Returns start index of first occurrence of string in input, or -1 if no match.

Signature

> str index-of (string) ...rest --grapheme-clusters --utf-8-bytes --range --end

string: the string to find in the input
...rest: For a data structure input, search strings at the given cell paths, and replace with result
--grapheme-clusters (-g): count indexes using grapheme clusters (all visible chars have length 1)
--utf-8-bytes (-b): count indexes using UTF-8 bytes (default; non-ASCII chars have length 2+)
--range {range}: optional start and/or end index
--end (-e): search from the end of the input

Returns index of string in input

>  'my_library.rb' | str index-of '.rb'
10

Count length using grapheme clusters

> '🇯🇵ほげ ふが ぴよ' | str index-of -g 'ふが'
4

Returns index of string in input within arhs open range

>  '.rb.rb' | str index-of '.rb' -r 1..
3

Returns index of string in input within a lhs open range

>  '123456' | str index-of '6' -r ..4
-1

Returns index of string in input within a range

>  '123456' | str index-of '3' -r 1..4
2

Returns index of string in input

>  '/this/is/some/path/file.txt' | str index-of '/' -e
18