我之前写过这个片段,它将教你如何使用正则表达式查找和突出显示单词/短语,你可以轻松地将其调整为 WORD 文档阅读,然后问题的最重要部分将通过以下方式解决:
#Region " [RichTextBox] FindNext RegEx "
' [ FindNext RegEx ]
'
' //By Elektro H@cker
'
' Examples :
'
' RichTextBox1.Text = "Hello World!, Hello World!, Hello World!"
'
' FindNext(RichTextBox1, "hello", FindDirection.Down, System.Text.RegularExpressions.RegexOptions.IgnoreCase, Color.LightBlue, Color.Black)
' FindNext(RichTextBox1, "hello", FindDirection.Up, System.Text.RegularExpressions.RegexOptions.IgnoreCase, Color.Red, Color.Black)
'
' Private Sub RichTextBox_Enter(sender As Object, e As EventArgs) ' Handles RichTextBox1.Enter
' ' Restore Selection Colors before search next match.
' sender.SelectionBackColor = DefaultBackColor
' sender.SelectionColor = DefaultForeColor
' End Sub
Public Enum FindDirection As Short
Up = 0
Down = 1
End Enum
' FindNext
Private Sub FindNext(ByVal [Control] As RichTextBox, _
ByVal SearchText As String, _
ByVal Direction As FindDirection, _
Optional ByVal IgnoreCase As System.Text.RegularExpressions.RegexOptions = System.Text.RegularExpressions.RegexOptions.None, _
Optional ByVal Highlight_BackColor As Color = Nothing, _
Optional ByVal Highlight_ForeColor As Color = Nothing)
If [Control].TextLength = 0 Then Exit Sub
' Start searching at 'SelectionStart'.
Dim Search_StartIndex As Integer = [Control].SelectionStart
' Stores the MatchIndex count
Dim matchIndex As Integer = 0
' Flag to check if it's first find call
Static First_Find As Boolean = True
' Checks to don't ommit the selection of first match if match index is exactly at 0 start point.
If First_Find _
AndAlso Search_StartIndex = 0 _
AndAlso Direction = FindDirection.Down Then
Search_StartIndex = -1
First_Find = False
ElseIf Not First_Find _
AndAlso Search_StartIndex = 0 _
AndAlso Direction = FindDirection.Down Then
First_Find = False
Search_StartIndex = 0
End If
' Store the matches
Dim matches As System.Text.RegularExpressions.MatchCollection = _
System.Text.RegularExpressions.Regex.Matches([Control].Text, _
SearchText, _
IgnoreCase Or If(Direction = FindDirection.Up, _
System.Text.RegularExpressions.RegexOptions.RightToLeft, _
System.Text.RegularExpressions.RegexOptions.None))
If matches.Count = 0 Then First_Find = True : Exit Sub
' Restore Highlight colors of previous selection
[Control].SelectionBackColor = [Control].BackColor
[Control].SelectionColor = [Control].ForeColor
' Set next selection Highlight colors
If Highlight_BackColor = Nothing Then Highlight_BackColor = [Control].BackColor
If Highlight_ForeColor = Nothing Then Highlight_ForeColor = [Control].ForeColor
' Set the match selection
For Each match As System.Text.RegularExpressions.Match In matches
matchIndex += 1
Select Case Direction
Case FindDirection.Down
If match.Index > Search_StartIndex Then ' Select next match
[Control].Select(match.Index, match.Length)
Exit For
ElseIf match.Index <= Search_StartIndex _
AndAlso matchIndex = matches.Count Then ' Select first match
[Control].Select(matches.Item(0).Index, matches.Item(0).Length)
Exit For
End If
Case FindDirection.Up
If match.Index < Search_StartIndex Then ' Select previous match
[Control].Select(match.Index, match.Length)
Exit For
ElseIf match.Index >= Search_StartIndex _
AndAlso matchIndex = matches.Count Then ' Select last match
[Control].Select(matches.Item(0).Index, matches.Item(0).Length)
Exit For
End If
End Select
Next match
' Set the current selection BackColor
[Control].SelectionBackColor = Highlight_BackColor
' Set the current selection ForeColor
[Control].SelectionColor = Highlight_ForeColor
' Scroll to Caret/Cursor selection position
[Control].ScrollToCaret()
End Sub
#End Region
您还可以在这里观看视频演示:http ://www.youtube.com/watch?v=mWRMdlC5DH8