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Is Regex the best way to do simple pattern matching in VB?

Posted on 2008-10-09
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Last Modified: 2010-04-23
Is Regex the best way to do simple pattern matching in VB.NET.

Here I'm check in the string has the word News in it.

            Dim objMatch As Match

            objMatch = Regex.Match("News", sSave.ToString)

            If (objMatch.Success) Then
                '     sSave = "Got News"
            End If
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Question by:vaultworld
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5 Comments
 
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Accepted Solution

by:
rlh68 earned 1000 total points
ID: 22683482

I use IndexOf for simply searching.

    Dim str As String = "Some text to search for the word News in."
        If Str.IndexOf("News") > 0 Then
            ' has news, do something
        End If
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Author Comment

by:vaultworld
ID: 22683553
Thanks,  it does have a weakness.

If the string is the same size that your looking for it doesn't work.

Example looks for News inside of News
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Assisted Solution

by:Zippit
Zippit earned 1000 total points
ID: 22683671
actually...it does.  In the previous example, change the following line:

If Str.IndexOf("News") > 0 Then

To:

If Str.IndexOf("News") >= 0 Then

The it will work, even when searching for "News" inside of "News" (IndexOf returns -1 if no match, 0 if match is found at first character).

HTH
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LVL 7

Expert Comment

by:Zippit
ID: 22683677
IndexOf is the way to go if you are looking for a simple string within another string.  Don't get RegEx unless you are looking for more complex patterns (like multiple strings separated by any number of characters, patterns, etc).
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Author Closing Comment

by:vaultworld
ID: 31504882
Thanks a ton, both of you
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