Microsoft Visual Basic 2010 Step by Step eBook

328 Part II Programming Fundamentals

String

Method or

Property

Visual

Basic

Function Description String Example

Contains Instr Determines whether the

specified string occurs in

the current string.

Dim region As String

Dim result As Boolean

region = "Germany"

result = region.Contains("Ge")

'result = True

Substring Mid Returns a fixed number

of characters in a string

from a given starting point.

(Note: The first element in

a string has an index of 0 .)

Dim Cols, Middle As String

Cols = "First Second Third"

Middle = Cols.SubString(6, 6)

'Middle = "Second"

IndexOf InStr Finds the starting point of

one string within a larger

string.

Dim Name As String

Dim Start As Short

Name = "Abraham"

Start = Name.IndexOf("h")

'Start = 4

Trim Trim Removes leading and

following spaces from a

string.

Dim Spacey, Trimmed As String

Spacey = " Hello "

Trimmed = Spacey.Trim

'Trimmed = "Hello"

Remove N/A Removes characters from

the middle of a string.

Dim RawStr, CleanStr As String

RawStr = "Hello333 there"

CleanStr = RawStr.Remove(5, 3)

'CleanStr = "Hello there"

Insert N/A Adds characters to the

middle of a string.

Dim Oldstr, Newstr As String

Oldstr = "Hi Felix"

Newstr = Oldstr.Insert(3, "there

")

'Newstr = "Hi there Felix"

Compare StrComp Compares strings and can

disregard case differences.

Dim str1 As String = "Soccer"

Dim str2 As String = "SOCCER"

Dim Match As Integer

Match = String.Compare(str1, _

str2, True)

'Match = 0 [strings match]

CompareTo StrComp Compares a string to the

current string and checks

for case differences

Dim str1 As String = "Soccer"

Dim str2 As String = "SOCCER"

Dim Match As Integer

Match = str1.CompareTo(str2)

'Match = -1 [strings do not

match]

Replace Replace Replaces all instances of a

substring in a string with

another string.

Dim Oldstr, Newstr As String

Oldstr= "*se*ll"

Newstr = Oldstr.Replace( _

"*", "ba")

'Newstr = "baseball"