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find_first

Signature

find_first(string, string, number, number)

Description

Returns the zero-based index of the first occurence where the substring appears in a string or null if it does not appear.

Examples

find_first('subject string', 'string', `0`) == `8`

find_first('subject string', 'string', `8`) == `8`

find_first('subject string', 'string', `9`) == null

find_first('subject string', 'string', `0`, `14`) == `8`

find_first('subject string', 'string', `0`, `13`) == null