[RESOLVED] Regular Expression help

Hi

well i have kinda complicated Regular Expression i need to do if some one can help me with this it'll be great..

basically this is what I need to do:

i have this string:

Code:

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[PlayerID=12345]

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i need to find any number of this string and replace them to hyperlink like so:

Code:

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<a href='somestaticwebaddress?PlayerID=12345'>12345</a>

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the address querystring parameter and the hyperlink title should be the "12345" in the found string

this is what i have so far:

Code:

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Regex reg = new Regex(@"^\[PlayerID=");
        ltl.Text = (reg.Replace("[PlayerID=123]","<a href=''>")).ToString();

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this is the first i'm trying Regex ...

any ideas ?

Thanks.

Hey motil, here's a good way to do it, I did it in C# as your code sample seemed to be in C#:

csharp Code:

private void button1_Click(object sender, EventArgs e)
        {
            string s = "[PlayerID=12345]";
            Regex patern = new Regex(@"\[(PlayerID=(\d+))\]");
            MatchEvaluator matchEval = new MatchEvaluator(GetReplacement);
 
            s = patern.Replace(s,GetReplacement);
 
            MessageBox.Show(s);
 
        }
 
        private string GetReplacement(Match m)
        {
            return "<a href='somestaticwebaddress?" + m.Groups[1] + "'>" + m.Groups[2] + "</a>";
        }

Basically in m.Groups[0] you get the complete match, in Groups[1] and Groups[2] you get the part of the match that are placed in parenthesis in the declared patern. Have a look at the MSDN page on MatchEvaluator, its very useful when it comes to using RegEx to replace values.

EDIT : I should've used StringBuilder in GetReplacement instead of concatenation operators.

Have fun with the RegEx !

Thanks a lot!

i really need to improve my regx skills..any good sources / books ?
anyway thanks again!

And my stab at it :)

Code:

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    Private r As System.Text.RegularExpressions.Regex = New System.Text.RegularExpressions.Regex("\d+", System.Text.RegularExpressions.RegexOptions.Compiled)

    Sub Main()
        Dim x = "[PlayerID=12345]"
        Dim n = Val2(x)
        Dim out = String.Format("<a href=""something.aspx?PlayerID={0}""n</a>", n)
        Stop
    End Sub

    Function Val2(ByVal Input As String) As Integer?
        If r.IsMatch(Input) Then
            Return r.Match(Input).ToString
        End If
    End Function

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Though by the looks of it it's the same regular expression :D

Quote:

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Originally Posted by motil

i really need to improve my regx skills..any good sources / books ? !

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I've always found http://www.regular-expressions.info/ to be an excellent source.

Quote:

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Originally Posted by motil

Thanks a lot!

i really need to improve my regx skills..any good sources / books ?
anyway thanks again!

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You're welcome.

sorry I mostly used MSDN documentation (Links in my signature).

Quote:

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Originally Posted by plender

And my stab at it :)

Code:

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    Private r As System.Text.RegularExpressions.Regex = New System.Text.RegularExpressions.Regex("\d+", System.Text.RegularExpressions.RegexOptions.Compiled)

    Sub Main()
        Dim x = "[PlayerID=12345]"
        Dim n = Val2(x)
        Dim out = String.Format("<a href=""something.aspx?PlayerID={0}""n</a>", n)
        Stop
    End Sub

    Function Val2(ByVal Input As String) As Integer?
        If r.IsMatch(Input) Then
            Return r.Match(Input).ToString
        End If
    End Function

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Though by the looks of it it's the same regular expression :D

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Yeah almost the same Regular expression.

plender's example's failed but it just need a bit of tweaking :)

Bugger - the closing right angle bracket?

yea i think so, but as i said only some tweaking needed :)

What's a little tweaking between friends :D

Quote:

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Originally Posted by plender

What's a little tweaking between friends :D

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heh :lol: