[RESOLVED] Regular Expression help

[motil]

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:

[PlayerID=12345]

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

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

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

this is what i have so far:

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

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

any ideas ?

Thanks.

[stlaural]

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

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 !

[motil]

Thanks a lot!

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

[plender]

And my stab at it

    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

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

[MattP]

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

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

[stlaural]

Thanks a lot!

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

You're welcome.

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

And my stab at it

    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

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

Yeah almost the same Regular expression.

[motil]

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

[plender]

Bugger - the closing right angle bracket?

[motil]

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

[plender]

What's a little tweaking between friends

[motil]

What's a little tweaking between friends

heh