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Check On Which Word The Mouse Hover In Rich Text Box

'Add 1 Rich Text Box and 1 Label to your form.
'Insert the following code to your form:

Private Const EM_CHARFROMPOS& = &HD7
Private Type POINTAPI
x As Long
y As Long
End Type

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
lParam As Any) As Long

Public Function RichWordOver(rch As RichTextBox, x As Single, y As Single) As String
Dim pt As POINTAPI
Dim pos As Integer
Dim start_pos As Integer
Dim end_pos As Integer
Dim ch As String
Dim txt As String
Dim txtlen As Integer
pt.x = x \ Screen.TwipsPerPixelX
pt.y = y \ Screen.TwipsPerPixelY
pos = SendMessage(rch.hWnd, EM_CHARFROMPOS, 0&, pt)
If pos <= 0 Then Exit Function
txt = rch.Text
For start_pos = pos To 1 Step -1
ch = Mid$(rch.Text, start_pos, 1)
If Not ((ch >= "0" And ch <= "9") Or (ch >= "a" And ch <= "z") Or _
(ch >= "A" And ch <= "Z") Or ch = "_" ) Then Exit For
Next start_pos
start_pos = start_pos + 1
txtlen = Len(txt)
For end_pos = pos To txtlen
ch = Mid$(txt, end_pos, 1)
If Not ((ch >= "0" And ch <= "9") Or (ch >= "a" And ch <= "z") Or _
(ch >= "A" And ch <= "Z") Or ch = "_") Then Exit For
Next end_pos
end_pos = end_pos - 1
If start_pos <= end_pos Then _
RichWordOver = Mid$(txt, start_pos, end_pos - start_pos + 1)
End Function

Private Sub Form_Load()
RichTextBox1.Text = "This example will show you how to" & _
vbCrLf & vbCrLf & "know on which word the mouse hover in Rich Text Box"
End Sub

Private Sub RichTextBox1_MouseMove(Button As Integer, Shift As Integer, x _
As Single, y As Single)
Dim txt As String
txt = RichWordOver(RichTextBox1, x, y)
If Label1.Caption <> txt Then _
Label1.Caption = txt
End Sub

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