"Find and Replace" Algorithm

Dear all,

I am writing an edito. Can anyone of you  tell me where to find the algorithm how to write functionality of "Find and Replace" for an editor.

Best Regards,

MGlobal.
LVL 1
MGlobalAsked:
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CTripCommented:
1.create a Form and called it: "frmMain"
  put in the form RichTextBox1
  (RichTextBox1 will contain many words)
  create a button "find_and_replace" with that code:
    frmSearch.Show , Me


2.create a Form with the name: "frmSearch"
  put in the form: text1, Command1
  (text1 will contain the word to search)
  "frmSearch" code:

Public Sub Command1_Click()
'Dim text1.text
Dim pos As Integer
    pos = frmMain.RichTextBox1.SelStart
    If chkCaseSensitive.Value = vbChecked Then
        pos = InStr(pos + 1, frmMain.RichTextBox1.Text, txtSearch.Text)
    Else
        pos = InStr(pos + 1, frmMain.RichTextBox1.Text, txtSearch.Text)
    End If
    If pos = 0 Then
        frmMain.RichTextBox1.SelStart = 0
        frmMain.RichTextBox1.SelLength = 0
    Else
        frmMain.RichTextBox1.SelStart = pos - 1
        frmMain.RichTextBox1.SelLength = Len(txtSearch.Text)
    End If
   
txtSearch.Text = Text1.Text
rsButton5_Click
End Sub
Private Sub rsButton5_Click()
Dim pos As Integer

    pos = frmMain.RichTextBox1.SelStart
    pos = InStr(pos + 2, frmMain.RichTextBox1.Text, txtSearch.Text)
    If pos = 0 Then
        frmMain.RichTextBox1.SelStart = 0
        frmMain.RichTextBox1.SelLength = 0
    Else
        frmMain.RichTextBox1.SelStart = pos - 1
        frmMain.RichTextBox1.SelLength = Len(txtSearch.Text)

    'Replace The Word ----------->
    'TO REPLACE THE WORD WITH ANOTHER WORD
    'frmMain.RichTextBox1.SelText = "WORD2"
   
    End If
  If frmMain.RichTextBox1.Visible = True Then
txtSearch.Text = frmMain.RichTextBox1.SelText
End If
End Sub
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
Using the InStr() function, you should be able to do your job...
0
 
Ryan ChongCommented:
Hi,

Use the Replace function in VB6
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hongjunCommented:
Use replace function to replace string occurences. Try the below piece of code.

dim str1 as string

str1 = "Hello World"
replace(str1, "Hello", "hehe")
msgbox str1

hongjun
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hongjunCommented:
ryancys, I did not see your code when I type mine. It is just less than a minute difference.

For your information, replace function is not in VB5.

hongjun
0
 
Ryan ChongCommented:
Hi hungjun,

It's ok :)
0
 
hongjunCommented:
:)
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andysalihCommented:
reject the proposed answer if you want more feed from EE users

o by the way nealy forgot

this will do the trick for you

Use this function to do a search and replace function. It works by finding the next instance of the string that you are looking for, and gets everything to the left and right of it, inserting the new string between the two parts.

Public Function replaceall(searchstring As String, _
findstring As String, replacestring As String) As String

Dim curpos As Long

curpos = 1

Do

curpos = InStr(curpos, searchstring, findstring)
searchstring = Left$(searchstring, curpos - 1) & _
replacestring & Right$(searchstring, Len(searchstring) _
- curpos - Len(findstring) + 1)

Loop Until InStr(searchstring, findstring) = 0

replaceall = searchstring

End Function
You could easily modify this function to search only a certain range of the string, if you needed


cheers
Andy
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Valliappan ANSenior Tech ConsultantCommented:
Have a look at:
http://www.freevbcode.com/ShowCode.Asp?ID=1902
(Find And Replace for Edit Controls)

Easy and simple.

Hope this helps.
0
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