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PORegEx slows down if text not read from RichTextBox
 

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    <p>I found a strange issue with the combination of RichTextBox and RegEx. If I load a text file into a RichTextBox and use</p> <pre><code>Dim matches As MatchCollection = Regex.Matches(RichTextBox1.Text, "^H(.+\t){10}\n", RegexOptions.Multiline Or RegexOptions.IgnoreCase) </code></pre> <p>then the RegEx will run blazing fast. OTOH if I load the text from a file straight into a string and feed this string with RegEx.Matches using</p> <pre><code>Dim FullText As String = New StreamReader("c:\Temp\TextFile.txt", System.Text.Encoding.UTF8, True).ReadToEnd Dim matches As MatchCollection = Regex.Matches(FullText, "^H(.+\t){10}\n", RegexOptions.Multiline Or RegexOptions.IgnoreCase) </code></pre> <p>then the regex will run for ages.</p> <p>Now obviously the RichTextBox does something to the text. I found that loading the text into the RichTextBox will eliminate the first 4 bytes of the text (is that the byte order mark?). However, trimming those 4 characters with SubString won't solve the problem. RichTextBox does some other processing that I'm unaware of.</p> <p>I'm using RegEx both on client and server side (client can load text files into a RichTextBox to test and setup various RegEx's and the server will process text files according to these previously setup RegEx's). Needless to say that a regex will run blazing fast on the text file loaded into a RichTextBox, while the very same RegEx ran through the very same text file will seem to lock up the server side service.</p> <p>My question: what kind of text processing does the RichTextBox do and how can I mimic the behavior in a server-side process?</p> <p>Thank you for your kind help in advance.</p> <p>Best Regards, Daniel</p>
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