Python: iterate over the graphemes in a string.

gistfile1.py

import unicodedata as u

def itergraphemes(str):
  def modifierp(char): return u.category(char)[0] == 'M'
  start = 0
  for end, char in enumerate(str):
    if not modifierp(char) and not start == end:
      yield str[start:end]
      start = end
  yield str[start:]

https://grapheme.readthedocs.io/en/latest/grapheme.html