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.

These are the formal rules for forming basic UNIX regular expressions. For some simple examples, skip to Simple Examples. The rules come from the Solaris 7 regexp(5) manual page. The I2A2 reflector ...

The simplest regular expressions are DOS/Windows wildcards; for example, *.html refers to all file names with HTML extensions. However, regular expression functions are available in many ...

Regular expressions might seem arcane, but if you do any kind of software, they are a powerful hacker tool. Obviously, if you are writing software or using tools like grep, awk, sed, Perl, or just ...