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PORegex Pattern Matching
 

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  1. PORegex Pattern Matching
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    <p>I am developing a regex/pattern tester in vb.net where I have three textbox's:</p> <ul> <li>Textbox1: Here I enter my regular expression for pattern matching in textbox2</li> <li>Textbox2: Upload the plain-texts from dB and then look for a match</li> <li>Textbox3: Displays the result of the search. </li> </ul> <p>Now the issue I am having is when I enter a regular expression in <strong>Textbox1</strong> and click search it is unable to find any matching pattern even though I have made sure a matching text is present in the paragraph.</p> <p>But whereas, if I enter the non-regex word/text itself in Textbox1 it is able to find a match.</p> <p>In my button click_event I have initiated all the relavent regex functions etc but still not able to figure out why it wont except regex expressions instead of the word itself.</p> <p>Here is the code I am using for pattern search:</p> <pre><code>Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim m As Match Dim re As Regex Dim matches As MatchCollection 'Clear result area tbResults.Text = "" Try re = New Regex(tbPattern.Text) Catch ex As Exception MsgBox("invalid regular expression") Exit Sub End Try If cbIgnoreCase.Checked And cbMultiline.Checked And cbSingleLine.Checked Then re = New Regex(tbPattern.Text, RegexOptions.IgnoreCase And RegexOptions.Multiline And RegexOptions.Singleline) ElseIf cbIgnoreCase.Checked And cbMultiline.Checked And (Not cbSingleLine.Checked) Then re = New Regex(tbPattern.Text, RegexOptions.IgnoreCase And RegexOptions.Multiline) ElseIf cbIgnoreCase.Checked And (Not cbMultiline.Checked) And cbSingleLine.Checked Then re = New Regex(tbPattern.Text, RegexOptions.IgnoreCase And RegexOptions.Multiline) ElseIf (Not cbIgnoreCase.Checked) And cbMultiline.Checked And cbSingleLine.Checked Then re = New Regex(tbPattern.Text, RegexOptions.Multiline And RegexOptions.Singleline) ElseIf cbIgnoreCase.Checked Then re = New Regex(tbPattern.Text, RegexOptions.IgnoreCase) ElseIf cbMultiline.Checked Then re = New Regex(tbPattern.Text, RegexOptions.Multiline) ElseIf cbSingleLine.Checked Then re = New Regex(tbPattern.Text, RegexOptions.Singleline) Else re = New Regex(tbPattern.Text) End If 'get matches matches = re.Matches(tbPgCon.Text) 'display matches found tbResults.Text = "Count : " &amp; matches.Count For Each m In matches tbResults.Text = tbResults.Text &amp; vbCrLf &amp; "----" &amp; vbCrLf &amp; m.Value Next Cursor.Current = Cursors.Default End Sub </code></pre>
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    1. PTQuestion
    1. This table or related slice is empty.
    1. USKevin
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    1. CODid you step through the code while debugging? Is tbPattern.Text actually what you put in textbox?
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      1. PORegex Pattern Matching
      1. USEdwin de Koning
    2. CO"Is tbPattern.Text actually what you put in textbox?" I am not sure what you mean? tbPattern.Text (textbox) is where I enter the regex pattern. It is not producing any errors but in the results textbox, it says Count: 0 which means no match found. I'll try stepping through the code again, just to be sure.
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      1. PORegex Pattern Matching
      1. USKevin
    3. COStepped through the code and when it reaches at "matches = re.Matches(tbPgCon.Text)", matches = Nothing ?!?!
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      1. PORegex Pattern Matching
      1. USKevin
 

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