[I]

[..]
  1. IDENTLEN
  2. IDSET
  3. IGNORE_CASE
  4. INCLUDE
  5. INCREFS
  6. INCS
  7. INHIBIT_STRING_HEADER
  8. INITIAL
  9. INITIALSIZE
  10. INIT_BUF_SIZE
  11. INIT_COMPILE_STACK_SIZE
  12. INIT_FAILURE_ALLOC
  13. INIT_FAIL_STACK
  14. INSERT_JUMP
  15. INSERT_JUMP2
  16. INTERVAL
  17. ISALNUM
  18. ISALPHA
  19. ISASCII
  20. ISBLANK
  21. ISCNTRL
  22. ISDIGIT
  23. ISGRAPH
  24. ISLOWER
  25. ISPRINT
  26. ISPUNCT
  27. ISSPACE
  28. ISUPPER
  29. ISXDIGIT
  30. IS_ACTIVE
  31. IS_CHAR_CLASS
  32. IS_CV_QUALIFIER
  33. IS_EMPTY
  34. IS_RESERVED_SHARP
  35. IS_RESERVED_VARIABLE
  36. IS_RESERVED_WORD
  37. IS_RESERVED_YACC
  38. IS_TYPE_QUALIFIER
[..]