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Regular Expression

Posted on 2008-06-26
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Last Modified: 2010-04-15
Hi

Any body know a nice regular expression that matches and gets <a> tags

IE if i have a document i would like to extract all the <a> assuming that the <a> has an ending tag (</a>)

Thanks

Allan
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Question by:acadenilla
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4 Comments
 
LVL 6

Expert Comment

by:Bruce_1975
ID: 21876377
<(?<a>\w*)>(?<text>.*)</\k<a>>

Regards,
Bruce
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Author Comment

by:acadenilla
ID: 21876622
bruce

I fails when i tried a simple link

<a href='asdfasdf.com'>first tag text</a>

could you explain to me the expression

I might need to handle some crazy link ie

<a id='asdfas' onmouseclick='asdfasdf' href='asdfasdf'><font><b>asdfasdfas</b><font></a>

or

<a href='aasdfasdf'><img></img></a>

thanks
0
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 1000 total points
ID: 21876721
Hi acadenilla;

This pattern will give you what you want.

' Test Data in a file
Dim sr As New StreamReader("HtmlData.htm")
' Read the data into a string
Dim input As String = sr.ReadToEnd()
' Find all the Matches for the pattern "<a.*?/a>"
Dim mc As MatchCollection = Regex.Matches(input, "<a.*?/a>")
For Each m As Match In mc
    ' Display the result in the output window of the IDE
    Console.WriteLine(m.Value)
Next


Fernando
0
 
LVL 6

Expert Comment

by:Bruce_1975
ID: 21876781
Just leave away the ?<text> and use

<(?<a>\w*)>(.*)</\k<a>>

<(?<a>\w*)> check for <a followed by any alphanummeric value, hast to close with >
(.*)                any number or character is allowed, any number of repetition
</\k<a>>       has to end with </a>
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