Fuzion • Idioms • Idiom # 62: Find substring position

Idiom # 62: Find substring position

Code

Running Example

ex62 is

  find (x, y String) =>
    i := x.find y
    say "found '$y' in '$x' at index $i"

  find "Hallo" "allo"
  find "Hallo" "allô"

  find ("a" *  16      ) ("a" * 7 + "b")
  find ("a" *  16 + "b") ("a" * 7 + "b")
  find ("a" *  32      ) ("a" * 15 + "b")
  find ("a" *  32 + "b") ("a" * 15 + "b")
  find ("a" *  64      ) ("a" * 31 + "b")
  find ("a" *  64 + "b") ("a" * 31 + "b")
  find ("a" * 128      ) ("a" * 63 + "b")
  find ("a" * 128 + "b") ("a" * 63 + "b")
  find ("a" * 256      ) ("a" * 127 + "b")
  find ("a" * 256 + "b") ("a" * 127 + "b")
  find ("a" * 512      ) ("a" * 255 + "b")
  find ("a" * 512 + "b") ("a" * 255 + "b")

  abc := "abcdefghijklmnopqrstuvwxyz"
  str := "the quick brown fox jumps over the lazy dog"
  for
    i in 0..(abc.byte_length-1)
  do
    s := abc.substring i i+1
    match str.find s
      nil => say "$s not found"
      ix i32 =>
        m := "found '$s' at index $ix: "
        say (m + str)
        say "{ "-" * (m.codepoint_length + ix) }^"

What are effects?

last changed: 2024-07-01

next: Idiom # 63: Replace fragment of a string