There is nothing wrong with the engine. It is perfectly correct. But you have to be very specific how you explain what you want or your intentions will not be understood.<div><br></div><div>^ and $ are very important because they signify that the regex should start matching from the beginning of the string to the end. Which is why \d{10} and ^\d{10}$ work differently<br>
<div><br></div><div>Given the following strings<div><br></div><div>1234567890</div><div>12345678901</div><div>123456789012</div><div>1234567890134</div><div><br></div><div>\d{10} will match all of them because it means look for strings that have 10 digits following each other.</div>
<div><br></div><div>If you want it to find COMPLETE strings that with with 10 digits following each other use ^\d{10}$. This will only match the first string</div><div><br></div><div><br><br><div class="gmail_quote">On Thu, Mar 4, 2010 at 9:58 AM, Simon Mbuthia <span dir="ltr">&lt;<a href="mailto:simon.mbuthia@gmail.com">simon.mbuthia@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Thank Conrad... but I think the engine is the one that&#39;s wrong, coz what would then be the difference between ^\d{10} and ^\d{10,} ?<div>
<div></div><div class="h5"><br><br><div class="gmail_quote">On 4 March 2010 00:27, Rad! <span dir="ltr">&lt;<a href="mailto:conradakunga@gmail.com" target="_blank">conradakunga@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">The regex you have is right. But it is also wrong<div><br></div><div>\d{10} means a number with 10 digits. A number with eleven digits also has ten digits.</div>

<div><br></div><div>If you mean that you want a string with exactly ten digits the regex you want is this one</div>
<div><br></div><div>^\d{10}$<div><div></div><div><br><br><div class="gmail_quote">On Wed, Mar 3, 2010 at 3:08 PM, Ndungi Kyalo <span dir="ltr">&lt;<a href="mailto:ndungi@gmail.com" target="_blank">ndungi@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
Thats a handfull. Perl Regex (which I believe .NET implements) would be<br><br>/[0-9]{10}/ ... And to be absolutely sure : /[0-9]{10,10}/<br><br>Its also possible that the slight differences between these regex engines is the reason our good friend was pulling at his hairs.<br>


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 <br clear="all">--<br>Ndungi Kyalo<br><a href="http://biblia.kenya.or.ke" target="_blank">biblia.kenya.or.ke</a></font><div><div></div><div><br><br><br>
<br><br><div class="gmail_quote">On Wed, Mar 3, 2010 at 11:44 AM,  <span dir="ltr">&lt;<a href="mailto:ashok%2Bskunkworks@parliaments.info" target="_blank">ashok+skunkworks@parliaments.info</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">



<div>On Wed, Mar 3, 2010 at 2:23 PM, Simon Mbuthia &lt;<a href="mailto:simon.mbuthia@gmail.com" target="_blank">simon.mbuthia@gmail.com</a>&gt; wrote:<br>
&gt; Never mind, I used<br>
&gt; if (!match.Success || txtAccountNum.Text.Length != 10) throw Exception else<br>
&gt; Endelea()<br>
&gt;<br>
<br>
</div>the posix regex for 10 digits looks like this :<br>
[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]<br>
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