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 21.4.8 String Searching
 -----------------------
 
 When searching for the index of a character in a string, these
 procedures can be used.
 
  -- Scheme Procedure: string-index str chr [frm [to]]
  -- C Function: scm_string_index (str, chr, frm, to)
      Return the index of the first occurrence of CHR in STR.  The
      optional integer arguments FRM and TO limit the search to a
      portion of the string.  This procedure essentially implements the
      `index' or `strchr' functions from the C library.
 
           (string-index "weiner" #\e)
           => 1
 
           (string-index "weiner" #\e 2)
           => 4
 
           (string-index "weiner" #\e 2 4)
           => #f
 
  -- Scheme Procedure: string-rindex str chr [frm [to]]
  -- C Function: scm_string_rindex (str, chr, frm, to)
      Like `string-index', but search from the right of the string
      rather than from the left.  This procedure essentially implements
      the `rindex' or `strrchr' functions from the C library.
 
           (string-rindex "weiner" #\e)
           => 4
 
           (string-rindex "weiner" #\e 2 4)
           => #f
 
           (string-rindex "weiner" #\e 2 5)
           => 4
 

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