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  1. PO
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    <p>No need for a regular expression here. You can use <a href="http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&amp;l=EN-US&amp;k=k%28SYSTEM.STRING.ISNULLORWHITESPACE%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV4.0%22%29;k%28DevLang-CSHARP%29&amp;rd=true" rel="nofollow"><code>string.IsNullOrWhitespace()</code></a></p> <p>A regular expression is this:</p> <pre><code>[^ ] </code></pre> <p>What this does is simple: It checks if your string contains anything that is not a space.</p> <p>I adjusted your code slightly by adding <code>match.Success</code> to the output:</p> <pre><code>var strings = new List&lt;string&gt; { "123", "1 3", "12 ", "1 " , " 3", " ", "" }; string r = "[^ ]"; foreach (string s in strings) { Match match = new Regex(r).Match(s); Console.WriteLine(string.Format("string='{0}', regex='{1}', match='{2}', " + "is match={3}", s, r, match.Value, match.Success)); } </code></pre> <p>The result will be:</p> <pre><code>string='123', regex='[^ ]', match='1', is match=True string='1 3', regex='[^ ]', match='1', is match=True string='12 ', regex='[^ ]', match='1', is match=True string='1 ', regex='[^ ]', match='1', is match=True string=' 3', regex='[^ ]', match='3', is match=True string=' ', regex='[^ ]', match='', is match=False string='', regex='[^ ]', match='', is match=False </code></pre> <p>BTW: Instead of <code>new Regex(r).Match(s)</code> you should use <code>Regex.Match(s, r)</code>. This allows the regex engine to cache the pattern.</p>
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    1. POHow to match anything but 'just spaces' using .Net Regex
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    1. USDaniel Hilgarth
    1. USDaniel Hilgarth
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    1. POHow to match anything but 'just spaces' using .Net Regex
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    1. COHi Daniel. I would like to use regex here if possible as I'm using regex for some other validation, not just the spaces issue.
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      1. USnuxibyte
    2. CO@errolc: Do you really need the value of the string as part of `match.Value`? Or is all you are interested in that `match.Success` is `true`?
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    3. COI just want to know if it matches. I don't care what the value is. I'm using it validate a string. Either its valid according to the regex 'validator'....in which case yay, continue or..... it isnt, barf and exit.
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