If you stick to the concepts that I cover later, they will work across most flavors and Linux utilities. You don't need to ...

But what kind of patterns are we talking about? Common examples of regular expressions determine for example if a given string is an email address or a phone number, or they can be used to verify ...

Like I said, simple, but powerful and one of the most used command line tools which is why I use it as the example in this article. But grep isn’t the only program that uses regular expressions.

Tony Northrup is a developer, security consultant and author with more than 10 years of professional experience developing applications for Microsoft Windows. Developers frequently need to process ...

Regular expressions, or “regex,” is a system ... using a particular regex against a particular string. Here is an easy example. import re text = 'b213 a13 x15' print (re.search(r'ad*W ...

This is, of course, just a taste of what regular expressions can do. Take the example of needing to find four letter words that end in “ext”. For this we use the special character ...

Even in the simple example above the engine had to backtrack several times while trying to match the input string to the regular expression. It’s easy to imagine what could happen to your ...

For example, let’s say you have a list of ... is much more powerful and allows you to use those cool regular expressions. A quick aside… I know RewriteEngine is more elegant, but it’s ...

regular expressions: globbing is done to filenames by the shell, and regex is used for searching text. The only frustrating exception to this is that sometimes the shell is too smart and conveniently ...