Now they have two problems. The quote is from Jamie Zawinski, a world class hacker who I admire greatly. If he's telling us not to use regular expressions, should we even bother? Maybe, if you live and die by soundbites. But there's a bit more to the story than that, as ...
“Some people, when confronted with a problem, think, ‘I know, I’ll use regular expressions.’ Now they have two problems.” While I am nowhere near as cynical about regexes as Mr. Zawinski, I will admit that it can be quite challenging just to write a correct ...
Regular Expressions in Ruby and RailsRegular expressions in Rails are bracketed by forward-slash, so a regular expression looks like this: /[0-9]*/. You can put all your usual modifiers after the second slash (such as i for case-insensitivity). Gone are other programming languages’ ...
Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems. In this article, we are going to look deeper into ReDoS and show what can go wrong. We'll investigate real-life examples of vulnerable regular expressions from outage ...
Regular Expressions From Scratch, Part Two: Some Examples of Languages 项目 2005/11/22 Let's look at some sample languages to get a sense of just how flexible languages can be. For example, here are some languages over the alphabet S = {0, 1} L1 = all members ...
Regular expressions are a much better means of performing this operation. The problem at hand is how to return all of the required data within a SQL construct. Table-valued functions are the answer. Table-valued functions are somewhat similar to the previous functions, but...
Numerous times in any given day, regular expressions help me solve problems both large and small (and quite often, ones that are small but would be large if not for regular expressions).Showing an example that provides the key to solving a large and important problem illustrates the benefit ...
In this blog post, I would like to share the latest news and changes made to Regular Expressions in modern ABAP, mainly from OP release 7.55 & 7.56. Previously, POSIX style regular expressions or “Portable Operating System Interface for uniX” was used in ABAP. Hence, from now on, regular...
(aaa)Denotes asub-expression. For instance, the(abra)(kadabra)pattern contains two sub-expressions:abraandkadabra. To specify a round bracket that should be treated literally, follow it with backslash:\(or\). a|bEitheraorb. For instance,ab|cdematchesabandcde, but notabde. Theht(m|ml)patt...
One of the most powerful features of regular expressions in the .NET Framework -- and of Nondeterministic Finite Automaton (NFA) regular expression engines generally -- is their ability to execute in a non-linear manner. That is, instead of advancing one charact...