Comments on: Commonly Used Regular Expressions http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/ Christian Webmaster Resources Fri, 12 Mar 2010 08:11:53 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Micha? Bachowski http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/comment-page-1/#comment-44 Micha? Bachowski Fri, 13 Jun 2008 08:41:24 +0000 http://smseserver.com/blog/2007/12/11/commonly-used-regular-expressions/#comment-44 Hi! As butters said - use preg_match() To validate date I prefer using strtotime(): $valid = strtotime($val)!==false; strtotime() function handles much more date variants. Regards. Hi!

As butters said – use preg_match()

To validate date I prefer using strtotime():
$valid = strtotime($val)!==false;

strtotime() function handles much more date variants.

Regards.

]]> By: Andrea http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/comment-page-1/#comment-41 Andrea Thu, 12 Jun 2008 15:40:07 +0000 http://smseserver.com/blog/2007/12/11/commonly-used-regular-expressions/#comment-41 Nice but this will reject both some valid email addresses (e.g. containing a single quote for an apostrophe: I had to ask the email admins at work to change my email address just because of all the web sites with similar validation rules that kept refusing it) and some valid URLs (e.g. plenty of top level domains are missing). A correct email address validating regular expression would need a VERY long regular expression, so you need to decide whether you prefer it too tolerant or too restrictive, and in most applications it is the tolerant one that you'll want. Nice but this will reject both some valid email addresses (e.g. containing a single quote for an apostrophe: I had to ask the email admins at work to change my email address just because of all the web sites with similar validation rules that kept refusing it) and some valid URLs (e.g. plenty of top level domains are missing).
A correct email address validating regular expression would need a VERY long regular expression, so you need to decide whether you prefer it too tolerant or too restrictive, and in most applications it is the tolerant one that you’ll want.

]]> By: Michael http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/comment-page-1/#comment-40 Michael Thu, 12 Jun 2008 15:12:43 +0000 http://smseserver.com/blog/2007/12/11/commonly-used-regular-expressions/#comment-40 Thanks. Very useful. Thanks. Very useful.

]]> By: Alex http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/comment-page-1/#comment-38 Alex Thu, 12 Jun 2008 13:42:54 +0000 http://smseserver.com/blog/2007/12/11/commonly-used-regular-expressions/#comment-38 Looks like a useful set of expressions. Good work. Looks like a useful set of expressions. Good work.

]]> By: jakyra http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/comment-page-1/#comment-37 jakyra Thu, 12 Jun 2008 13:39:38 +0000 http://smseserver.com/blog/2007/12/11/commonly-used-regular-expressions/#comment-37 ISBNs are best tested with math http://www.isbn.org/standards/home/isbn/international/html/usm4.htm ISBNs are best tested with math http://www.isbn.org/standards/home/isbn/international/html/usm4.htm

]]> By: butters http://www.webmastersbydesign.com/2007/12/11/commonly-used-regular-expressions/comment-page-1/#comment-36 butters Thu, 12 Jun 2008 12:25:47 +0000 http://smseserver.com/blog/2007/12/11/commonly-used-regular-expressions/#comment-36 Nice, but your regexp for ips would say that 999.999.999.999 is also valid ;) and preg is much faster most of the time! Nice, but your regexp for ips would say that 999.999.999.999 is also valid ;) and preg is much faster most of the time!

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