Function findSubString

Find a substring after a given offset.

Example

findSubString("42", 0, 1, 1, "Is 42 the answer?")
   // => [3, 1, 4]
findSubString("42", 7, 1, 8, "Is 42 the answer?")
   // => [-1, 1, 18]
findSubString("🙉", 0, 1, 1, "🙈\n\n\n1🙊🙉🙊")
   // => [8, 4, 3,]

Note that "🙉" is two bytes long in UTF-16 and that offset is counted in bytes.

Remarks

Returns offset, row, and column. In that order.