a ?[Dd]ay as a regular expression to match things like “HackaDay” and “Hack a day” and, even, “Hackaday” using a tool like grep, awk, or many programming languages. The most common ...

Some special characters in regex are used to capture common types of characters, so you don’t have to reinvent character classes for them: When you execute a regular expression on a string ...

Now that we’ve identified what is likely a common data pattern, we can begin to construct the regex to extract this data. Here I will copy and paste this code, along with a few lines before and ...

That's why only the first line matches the example regex statement. A handful of other common regex characters are useful when grepping text files. Remember just to mush them together to form the ...

Quick: If you shout "regular expressions" in a crowd of Linux users, what happens? Answer: Everyone will tell you the right way to use them, and every answer will be different. Regular expressions ...