For index based operations code units are more useful than code points. a = s.indexOf("e̬̱ͤ̈́̿̂̅́͟") b = s.indexOf("m̛̮̩͙ͦ͗͆̄̋́̄") s[a:b] This operation is

For index based operations code units are more useful than code points. a = s.indexOf("e̬̱ͤ̈́̿̂̅́͟") b = s.indexOf("m̛̮̩͙ͦ͗͆̄̋́̄") s[a:b] This operation is fast with code unit indices and slow with code point indices.