How do you find out if a user has entered a valid email address? Do you check for an at-sign, or is it more complicated? For many developers the answer is a regular expression, a little bit of code ...

Imagine you are looking for a name in a telephone directory, but you can't remember its exact spelling. You can spend ages searching through all the possible combinations, unless you have a tool that ...

For this work with regular expressions, we will start with a browser-based tool. Below is a list of file names. We want to write a regular expression that captures parts of each string. Copy the text ...

When you write scripts for other people, you need to expect the unexpected. It's a useful skill to catch issues and deliver an appropriate error message when ...

If you’ve struggled with regular expressions that took hours to match when you needed them to complete in seconds, this article is for you. Java developer Cristian Mocanu explains where and why the ...

A quick run down on how you can use regular expressions in your own programs to give you more power over searching and substituting text. Perl has long been an extremely popular choice for text ...

When working with regular expressions in a shell script the norm is to use grep or sed or some other external command/program. Since version 3 of bash (released in 2004) there is another option: ...