Browse by Tags

All Tags » CLR Internals » Quick Tips » Performance » Regular Expressions (RSS)
Monday, March 29, 2004 2:16 AM

Performance: Different methods for testing string input for numeric values...

So there was a blog entry about the VB .NET IsNumeric function today. The question was in regards to a C# equivalent. I have two things to say really. First, if you really want the IsNumeric function from VB you can always grab it out of Microsoft.VisualBasic...
Posted by Justin Rogers | 14 comment(s)
Filed under: , , , ,
Sunday, March 21, 2004 6:13 AM

Making the Regex engine choke... Ever wanted to? I'll show you how...

Okay, so back in the pre-V1 days I made a humongous regular expression alternation group and wanted to precompile that guy for maximum speed. What exactly is a humongous regular expression? Well imagine 12000 or so words, each on average of 10 characters...
Posted by Justin Rogers | 10 comment(s)
Filed under: , , ,
Saturday, March 20, 2004 9:36 PM

Want faster regular expressions? Maybe you should think about that IgnoreCase option...

Let me start with a disclaimer. RegexOptions.IgnoreCase is a very powerful option that allows you to match ignore character casing during matches irregardless of the currently running culture. In other words, this will allow you to take into account other...
Posted by Justin Rogers | 7 comment(s)
Filed under: , , , , ,
Friday, February 13, 2004 5:14 PM

Match vs MatchSparse, a regular expression implementation detail that may surprise you.

So out of the blue I printed the type of a Match, and found it wasn't a Match, but instead a MatchSparse. Okay, now I have to go look up the difference. It appears that a MatchSparse is created when you don't have sequentially ordered numeric capture...
Posted by Justin Rogers | 2 comment(s)
Filed under: , , ,
More Posts