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Regex IsMatch -- Profiling Performance Comparison

Posted on 2006-11-29
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Last Modified: 2007-12-19
I don't have profiling tools handy with me (like Compuware DevPartner stuff). Can someone add a button (Button1) to a form and add this code:

'''''
Imports System.Text.RegularExpressions
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myName As String = "Randy Given"
        If myName.Substring lSubstring(2, 1) = "n" Then
            Debug.WriteLine("myName.Substring(2, 1) = n")
        End If
        If Regex.IsMatch(myName.Substring(2, 1), "n") Then
            Debug.WriteLine("Regex.IsMatch(myName.Substring(2, 1), n)")
        End If
        If myName.Substring(2, 1) = "d" Then
            Debug.WriteLine("myName.Substring(2, 1) = d")
        End If
        If Regex.IsMatch(myName.Substring(2, 1), "d") Then
            Debug.WriteLine("Regex.IsMatch(myName.Substring(2, 1), d)")
        End If
    End Sub
End Class
'''''

Can you tell me what the profiling shows? Trying to see the difference between straight compare and a regex version.
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Question by:GivenRandy
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4 Comments
 
LVL 96

Accepted Solution

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Bob Learned earned 2000 total points
ID: 18044854
Randy are you looking to do this within a For loop that executes 1000's of times?  Otherwise it is pretty pointless to think about speed differences with such basic code.

Bob
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LVL 9

Author Comment

by:GivenRandy
ID: 18044935
I'm mostly curious. I always keep performance in the back of my mind, but usually only spend development time when it is critical (like you pointed out). I used to have the tools to do this, but don't anymore.
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LVL 96

Expert Comment

by:Bob Learned
ID: 18045064
If you are looking to check this code, I can tell you without even checking that regular expressions vs. simple substrings are inherently less optimized.  Regular expression engines are powerful, but can be slow, since the checking is done iteratively, and sequentially.

Bob
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LVL 9

Author Comment

by:GivenRandy
ID: 18045396
That's my assumption, too. I'll back-burner this one, but your first post is spot-on and will accept that. Thanks!
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