Finds the first occurrence of the substring target in src.

This script returns the index (i.e. byte) of the the first occurrence of substring target in str, starting from the given (optional) position.

The result may not correspond to the actual position of the first character of target in case src contains multi-byte or variable-length encoded characters.

The string is zero-indexed.

Parameters

src: source string.

target: substring to search.

start_from: optional starting position (default 0).

Return Value

The index of the first occurrence of target in src, -1 if target is not found in src.

Example command:

• str_find("Hello World!", "o")
  • returns 4
• str_find("Hello World!", "lo")
  • returns 3
• str_find("Hello World!", "o", 5)
  • returns 7
• str_find("abc", "z")
  • returns -1