Regular expresion to fidn repeated in a string

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HI
what I m trying to do is to only replace multiple tags occurring simultaneously e.g. .... ... should be replaced by single tag.

result = Regex.Replace(result, "(\r)( )+(\r)", "\r\r", RegexOptions.IgnoreCase);

I have tried

C#

{<br>}( )+{<br>}
[<br>]( )+[<br>]
(<br>)( )+(<br>)

But it doesn't work.

Thanks,
A

Posted 19-Mar-15 22:18pm

ASJ_SA

Updated 19-Mar-15 23:42pm

Thanks7872

v4

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OriginalGriff 20-Mar-15 4:37am

What are you actually trying to do?
Even with your values encoded so they don;t get swallowed, it's not obvious what you arr trying to achieve.
Perhaps an example of your input, and desired output would help us to understand?

Use the "Improve question" widget to edit your question and provide better information.

ASJ_SA 20-Mar-15 4:45am

I have an email coming in that needs to be formatted to remove extra spaces etc.
So I go through the html of the email and replace the multiple breaks.
so the code m using to do this is:
result = Regex.Replace(result, "(\r)( )+(\r)", "\r\r", RegexOptions.IgnoreCase);
but I need to also remove the multiple tags

Thanks7872 20-Mar-15 5:21am

Use reply button on comment. Otherwise the person won't come to know about your response.

2 solutions

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Peter Leow · Accepted Answer · 2015-03-19T22:42:00

Solution 1

If you want to replace all the

<br>

with "", try Regex.Replace() method:

XML

Imports System
Imports System.Text.RegularExpressions

Public Module Module1
    Public Sub Main()
        ' original string
        Dim input As String = "blah<br> blah<br>,,,"
        Dim output As String = Regex.Replace(input, "<br>", "")
        ' print out
        Console.WriteLine(input)
        Console.WriteLine(output)
    End Sub
End Module

++++[Round 2]+++++
If you meant to replace consecutive breaks like

blah<br><br>blah

with a single

<br>

then try this:

XML

Dim input As String = "blah<br> blah<br><br>,,,"
Dim output As String = Regex.Replace(input, "(<br>){2,}", "<br>")

{2,} means 2 or more of the preceding pattern.

Posted 19-Mar-15 22:42pm

Peter Leow

Updated 19-Mar-15 23:40pm

v4

Comments

ASJ_SA 20-Mar-15 4:48am

hi Peter, Thanks
but what I m trying to do is to oonly replace multiple tags occurring simultaneously
result = Regex.Replace(result, "(\r)( )+(\r)", "\r\r", RegexOptions.IgnoreCase);
I need something like this but with tags

Peter Leow 20-Mar-15 5:00am

Not clear. Can you show an example of "before" vs "after"?

ASJ_SA 20-Mar-15 5:06am

result = Regex.Replace(result, "(\r)( )+(\r)", "\r\r", RegexOptions.IgnoreCase);
this line of code replaces multiple occurance of \r with "\r\r"
What I want is to look for multiple occurance of (breaks in html) and replace with possibly one 
so I tried
result = Regex.Replace(result, "( )( )+( )", " ", RegexOptions.IgnoreCase);
but it doesn even find the multiple tags
I think its got something to do with the "<" in the string
bcoz msdn says its to indicate beginning of word.
Beginning of word < Matches only when a word begins at this point in the text.
so now I need to find out how to escape it..
I did try putting \ but no use

Thanks7872 20-Mar-15 5:23am

You want .... ... should be replaced by single ,but single one should not be replaced?

ASJ_SA 20-Mar-15 5:39am

yes:)

Peter Leow 20-Mar-15 5:40am

See round 2 of solution 1.

ASJ_SA 20-Mar-15 8:25am

That works on its own.. but somehow when my whole email is being searched it doesn seem to want to find it..m sure its something lil. Will investigate further. thnx again

Thanks7872 · Accepted Answer · 2015-03-19T23:55:00

Try this :

C#

Dim Your_String As String = "dsfsdfsdfsdfs <br> dsfsdfsdfsdfsdf <br><br><br><br><br><br> sdfsdf <br><br> sdfgssdg <br><br><br> sdfdsf <br> dssfsf <br>"

Dim options As RegexOptions = RegexOptions.None

Dim regex As New Regex("[<br>]{2,}", options)

Your_String = regex.Replace(Your_String, "<br>")

Reference : http://stackoverflow.com/a/206720/2645738[^]

Regards..

Regular expresion to fidn repeated <br> in a string

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