double spin text in richtextbox

Question

4.00/5 (1 vote)

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I want to implement this feature :

If I have a following sentence :

{My name is James Vick and I am a {member|user|visitor} on this {forum|website|site} and I am loving it | I am admin and I am a {supervisor|admin|moderator} on this {forum|website|site} and I am loving it}

on a click of button I want to generate this :

My name is James Vick and I am a member on this site and I am loving it

or

I am admin and I am an admin on this forum and I am loving it

The basic need is to randomly choose words between {|} braces

I have been able to do this for inner nest i.e. for {member|user|visitor}. But how do I include the outer nest of sentences also i.e. {something blah blah {blah1|blah2} and | something else} ?

Code for inner nest :

Private Sub SimpleButton3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SimpleButton3.Click
        Dim stringWithTextIn As String = RichTextBox1.Text
        Dim regex As New Regex("{(.*?)}")
        Dim r As String = regex.Replace(stringWithTextIn, New MatchEvaluator(AddressOf ReplaceMatch))
        RichTextBox2.Text = r
    End Sub

Private Function ReplaceMatch(ByVal m As Match) As String
        Dim parts = m.Groups(1).Value.Split("|"c)
        Return parts(r.Next(0, parts.Length))
    End Function

I know I just have to change the regex but what do I add in it to include outer braces?

Posted 30-Aug-10 16:22pm

amit_upadhyay

Updated 3-Sep-10 5:27am

Dalek Dave

v2

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Dalek Dave 3-Sep-10 11:27am

Edited for Grammar and Spelling.

2 solutions

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Chris Trelawny-Ross · Accepted Answer · 2010-09-03T08:49:00

You have to change the regex and you have to iterate until all nested '{}' groups are processed.

The regex expression needs to be:

"{([^{}]+)}"<br />

. This matches any expression that begins with '{' but does not contain either '{' or '}' - ensuring that it exactly matches one of your options groups.

You need to feed the output result string back into the regex replace, iteratively, until it no longer changes. Each time you do the replace, spans of '{...}' gets replaced by one of its options, leaving their containing '{...}' spans 'visible' to the next replace attempt (they are now visible because there is no longer a '{' or '}' nestled within).

Here's my test app (note - I've hard-coded the selected option; you'll need to change it):

VB

Public Shared Sub RunTest()
    Dim re As New Regex("{([^{}]+)}")
    Dim result As String = "{My name is James Vick and I am a {member|user|visitor} on this {forum|website|site} and I am loving it | I am admin and I am a {supervisor|admin|moderator} on this {forum|website|site} and I am loving it}"
     
    Do While result.Contains("{")
        result = re.Replace(result, New MatchEvaluator(AddressOf RegexTest.ReplaceMatch))
    Loop
 
    Console.WriteLine(result)
    Console.Write("Press any key to exit: ")
    Console.ReadKey
End Sub
 
Private Shared Function ReplaceMatch(ByVal m As Match) As String
    Return m.Groups.Item(1).Value.Split(New Char() { "|"c })(0)
End Function

Note - instead of tracking 'did the string change' I'm just testing to see if it still contains a '{'. It's good enough for a test app, but may not be safe enough for your app.

Dave Kerr · Accepted Answer · 2010-09-03T05:22:00

Solution 1

You're not planning to spam forums with this code are you? Generating random sentences? ;)

Posted 3-Sep-10 5:22am

Dave Kerr

Comments

amit_upadhyay 3-Sep-10 21:40pm

no, i saw this in a software and tried to implement it

amit_upadhyay 3-Sep-10 21:57pm

Reason for my vote of 1
if you cant help then dont