Visual Basic.NET How to Program (PDF)

Chapter 15 Strings, Characters and Regular Expressions 645
19
20 output &= vbCrLf & """$"" is located at index " & _
21 letters.IndexOf("$"c, 3, 5)
22
23 ' test LastIndexOf to find a character in a string
24 output &= vbCrLf & vbCrLf & "Last ""c"" is located at " & _
25 "index " & letters.LastIndexOf("c"c)
26
27 output &= vbCrLf & "Last ""a"" is located at index " & _
28 letters.LastIndexOf("a"c, 25)
29
30 output &= vbCrLf & "Last ""$"" is located at index " & _
31 letters.LastIndexOf("$"c, 15, 5)
32
33 ' test IndexOf to locate a substring in a string
34 output &= vbCrLf & vbCrLf & """def"" is located at" & _
35 " index " & letters.IndexOf("def")
36
37 output &= vbCrLf & """def"" is located at index " & _
38 letters.IndexOf("def", 7)
39
40 output &= vbCrLf & """hello"" is located at index " & _
41 letters.IndexOf("hello", 5, 15)
42
43 ' test LastIndexOf to find a substring in a string
44 output &= vbCrLf & vbCrLf & "Last ""def"" is located " & _
45 "at index " & letters.LastIndexOf("def")
46
47 output &= vbCrLf & "Last ""def"" is located at " & _
48 letters.LastIndexOf("def", 25)
49
50 output &= vbCrLf & "Last ""hello"" is located at " & _
51 "index " & letters.LastIndexOf("hello", 20, 15)
52
53 ' test IndexOfAny to find first occurrence of character
54 ' in array
55 output &= vbCrLf & vbCrLf & "First occurrence of ""c""," & _
56 " ""a"" or ""$"" is located at " & _
57 letters.IndexOfAny(searchLetters)
58
59 output &= vbCrLf & "First occurrence of ""c"", ""a"" or " & _
60 """$"" is located at " & _
61 letters.IndexOfAny(searchLetters, 7)
62
63 output &= vbCrLf & "First occurrence of ""c"", ""a"" or " & _
64 """$"" is located at " & _
65 letters.IndexOfAny(searchLetters, 20, 5)
66
67 ' test LastIndexOfAny to find first occurrence of character
68 ' in array
69 output &= vbCrLf & vbCrLf & "Last occurrence of ""c""," & _
70 " ""a"" or ""$"" is located at " & _
71 letters.LastIndexOfAny(searchLetters)
Fig. 15.6 Searching for characters and substrings in Strings (part 2 of 3).