http://jaysonknight.com/blog/archive/2005/08/10/Test-if-a-String-is-Numeric.aspxI came across this little dandy whilst browsing a very popular asp.net community site (code like this makes me want to beat whoever wrote it to death with a wet noodle); the question was “how do I test a string to see if it’s numeric”…one of the answersenCommunityServer 2008.5 SP2 (Debug Build: 40407.4157)http://jaysonknight.com/blog/archive/2005/08/10/Test-if-a-String-is-Numeric.aspx#1750Fri, 12 Aug 2005 08:54:28 GMT68946f8a-ff84-48ba-8722-56d2a9e13499:1750mousseok, i made these without thinking too hard: for ints try ^([-+]?\d+)$ for floats, try ^([-+]?\d+\.?\d*)$ presuming +/- negatives rather than paren negatives. www.regexlib.com == da bomb<div style="clear:both;"></div><img src="http://jaysonknight.com/aggbug.aspx?PostID=1750" width="1" height="1">http://jaysonknight.com/blog/archive/2005/08/10/Test-if-a-String-is-Numeric.aspx#1748Fri, 12 Aug 2005 06:30:07 GMT68946f8a-ff84-48ba-8722-56d2a9e13499:1748Jayson KnightSomeone provide the regex and I'll be happy to run some performance tests...I'm gunning for the char[] solution to be the fastest, but I'd love to be proven wrong!<div style="clear:both;"></div><img src="http://jaysonknight.com/aggbug.aspx?PostID=1748" width="1" height="1">http://jaysonknight.com/blog/archive/2005/08/10/Test-if-a-String-is-Numeric.aspx#1747Fri, 12 Aug 2005 03:01:25 GMT68946f8a-ff84-48ba-8722-56d2a9e13499:1747mousseer, an iterated char-array solution? sounds like a PITA for just assessing if a string's numeric.. what about regular expressions? i don't honestly know how weighty their overhead..<div style="clear:both;"></div><img src="http://jaysonknight.com/aggbug.aspx?PostID=1747" width="1" height="1">http://jaysonknight.com/blog/archive/2005/08/10/Test-if-a-String-is-Numeric.aspx#1745Thu, 11 Aug 2005 17:47:39 GMT68946f8a-ff84-48ba-8722-56d2a9e13499:1745Keyvan NayyeriYou added a false &quot;q&quot; to ASP.NET forums link! ;) And another issue about CS: Your commenting system does not remember me!!<div style="clear:both;"></div><img src="http://jaysonknight.com/aggbug.aspx?PostID=1745" width="1" height="1">http://jaysonknight.com/blog/archive/2005/08/10/Test-if-a-String-is-Numeric.aspx#1741Thu, 11 Aug 2005 08:58:23 GMT68946f8a-ff84-48ba-8722-56d2a9e13499:1741HaackedSince your trackbacks are down, I thought I'd do a manual trackback here. <a rel="nofollow" target="_new" href="http://haacked.com/archive/2005/08/10/9293.aspx">http://haacked.com/archive/2005/08/10/9293.aspx</a><div style="clear:both;"></div><img src="http://jaysonknight.com/aggbug.aspx?PostID=1741" width="1" height="1">