This is a simple program that takes a regexp and one or more file names (unless you want to read from standard input). By default, it prints any lines that match the regexp. Like I said ...

In the rules RE stands for regular expression. 1.1 An ordinary character (not one of those discussed in 1.2 below) is a one-character RE that matches itself. 1.2 A backslash (\) followed by any ...

One of the most powerful tools for ensuring accurate API and data validation is Regular Expressions (regex). When combined ...

each clue is a regular expression (or a ‘regex’). To complete the puzzle, find the letter matching both the horizontal and vertical regex for each square. The Internet has many regex resources ...