github.com/hirochachacha/plua@v0.0.0-20170217012138-c82f520cc725/stdlib/utf8/testdata/len.lua (about)

     1  assert(utf8.len("abc") == 3)
     2  assert(utf8.len("あい") == 2)
     3  assert(utf8.len("あい", 4) == 1)
     4  assert(utf8.len("あい", 1, 4) == 2)
     5  
     6  ok, pos = utf8.len("あい", 2)
     7  assert(not ok and pos == 2)
     8  
     9  assert(utf8.len("") == 0)