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POHow can I create a regex that parses all lines of a string for a substring, and returns a match only if the substring is not found?
 

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  1. POHow can I create a regex that parses all lines of a string for a substring, and returns a match only if the substring is not found?
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    <p>I am trying to build a regular expression but am finding it difficult to do so for this one particular case. I want to return a match only if the string I am trying to parse does not contain a specific substring. For example (searching for the substring "test" with case insensitivity):</p> <pre><code>"Line one Line two Line test three" - Return false. "Line test one" - Return false. "Tfest" - Return true. "Tfest Tdhf Line three" - Return true. </code></pre> <p>I've been able to do this for single line strings using <code>^((?!message 1).)*$</code> but I'm not sure about multi-line strings.</p> <p>PS: I don't want to start a debate on using string operations VS regular expressions. Performance is a concern. The constraint of the question is that the solution must use regular expressions.</p>
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    1. USAlexandru
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    1. CO`\btest\b` would work, if `IsMatch` then you can just run your code for it contains substring.
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      1. POHow can I create a regex that parses all lines of a string for a substring, and returns a match only if the substring is not found?
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    2. CO@abc123 It does not seem to work for @"Line onetddest (NEWLINE) messadge 1dwd"
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      1. POHow can I create a regex that parses all lines of a string for a substring, and returns a match only if the substring is not found?
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    3. COTry using the flag [`RegexOptions.SingleLine`](http://msdn.microsoft.com/en-us/library/443e8hc7(vs.71).aspx).
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      1. POHow can I create a regex that parses all lines of a string for a substring, and returns a match only if the substring is not found?
      1. USJerry
 

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