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• Making Dynamic XHTML pages valid with a Regex

  I have a website that I use primarily to expand and sharpen my web development skills. The latest effort in that regard had been writing valid markup. Although there is some usable function to this site I use mainly for practice. Consequently I don’t Read More... Posted Wednesday, January 26, 2005 4:47 PM by mash | 2 Comments

• Higher plane solution

  I’ve come up with a workaround to Unicode plane bug I talk about earlier Originally I was trying to identify Unicode values outside of the ASCII range, code point higher than 127, for a replace. However the problem was characters in any other plane Read More... Posted Monday, November 08, 2004 12:45 PM by mash | 0 Comments

• Flavor of the month

  It seem most regex engines based their implementation on what had been done in the PERL version, with some implementing a little more, others a little less. This is what generally keeps regexes from being portable across different implementations. This Read More... Posted Tuesday, October 05, 2004 3:58 PM by mash | 1 Comments

• JScript Bug

  I saw a comment on the Regexlib that expression ^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,15}$ didn’t work for JavaScript. I responded mainly because the alternative offered didn’t wasn’t really an equivalent expression. But when I looked at Read More... Posted Tuesday, October 05, 2004 11:26 AM by mash | 2 Comments Filed under: Bugs/Quirks

• Switched at birth

  Seem there is another bug in the .Net regex engine concerning Unicode The characters matched by the Unicode categories for quotes are backwards. Pi – InitialQuotePunctuation Indicates that the character is an opening or initial quotation mark. Signified Read More... Posted Monday, September 13, 2004 11:28 AM by mash | 0 Comments Filed under: Bugs/Quirks

• Case and Class Ranges

  A very common character class pattern you will come across in the world of regular expressions is [a-zA-Z] which is just matching the letters of the English alphabet in upper and lower case. Here’s a tip if you are going to use a range in a character Read More... Posted Tuesday, August 31, 2004 9:47 AM by mash | 0 Comments Filed under: Bugs/Quirks

• One Regex to rule them all?

  I don't think so. Regular expressions have many uses. However finding one regex the is good for every possible scenario for the type of data the regex is matching is daunting. Recently Justin Rogers used one of my creations ,my datetime regex, as a negative Read More... Posted Saturday, August 14, 2004 12:09 AM by mash | 9 Comments Filed under: Dates

• Look out for Javascript

  JavaScript is fast becoming the bane of my existence, at least as far as regexes go. I recently blogged about how JavaScript behaves differently on the same valid pattern than .Net . I found another case of this. I’ve also blogged about testing Read More... Posted Thursday, August 05, 2004 12:21 PM by mash | 0 Comments Filed under: Dates, Bugs/Quirks

• Optional Groups in JavaScript

  Someone made a suggestion for one of my regexes on the regexlib . The suggestion was I modify the description to include a third option along with the two that were already present. To be honest I didn’t remember if I wanted to allow that third Read More... Posted Thursday, July 29, 2004 12:12 PM by mash | 2 Comments Filed under: Bugs/Quirks

• Validating Email : RFC 2822 Mailbox

  RFC 2822 Mailbox Someone emailed me asking if I had a regex to validate an E-mail address. I didn't so I just refered him to the regexlib I knew there were plenty there. But he said he had been there and none satisfied his criteria. Basically RRFC 2822 Read More... Posted Thursday, July 15, 2004 2:39 PM by mash | 1 Comments Filed under: Email

• Know Your Syntax(es)

  It's always good to know what syntax your regex engine, for the language you are working with, does and does not support. Some language support more, some less. I've seen a lot of comments on the regexlib about regexes that don't work in javascript and Read More... Posted Tuesday, July 13, 2004 6:30 PM by mash | 5 Comments

• Comments?

  I learned a few things, the hard way, about regex comments in VB. I was reading the Five Habits for Successful Regular Expressions and the first item is uses of whitespace and comments. Now I've down this on several of my regexps on the regexlib site, Read More... Posted Sunday, July 11, 2004 12:48 AM by mash | 0 Comments Filed under: Bugs/Quirks

• Historical Dates vs Calculated Dates

  This hasn't come up (yet) but I thought about it today so I'll talk about it now. My latest date regexps validate all Anno Domini (A.D.) dates. I want to point out that the dates in the past being validated are historical dates using both the Julian and Read More... Posted Thursday, June 24, 2004 1:15 AM by mash | 2 Comments Filed under: Dates

• Just a dash?

  Now I've seen plenty of tutorials and documentation mentioning some of the special characters inside a character class. The hat (^) symbol means negate the following characters if it is the first character in the class. Ex. [^ABC] means not A or B or Read More... Posted Thursday, June 17, 2004 5:37 PM by mash | 5 Comments Filed under: Bugs/Quirks

• Javascript Datetime regexps

  Well I'm at it again. I knocked out more regexps to handle dates. Why? Why not? Actually these are javascript compatible versions of my latest A.D calendar datetime regexps. I've seen a lot of comments on the regexlib complaining about expressions not Read More... Posted Thursday, June 17, 2004 2:33 PM by mash | 6 Comments Filed under: Dates