Regular expressions are built into many programming languages and used to match, search, and transform patterns of text in your programs. Get started with Regex.

Every Linux system comes with a dictionary file: a huge list of words in your language. This "words" file is useful for spell-checking, but you can put it to use in many different ways. Learn more ...

The regular expression language processes text input by reading the string and comparing it against a matching sequence. Let's build the regular expression that answers your question; we'll start by ...

There is still much more to the Regular Expression language, but it’s time to shift focus to some code examples. To work with Regular Expressions, the .NET Framework offers the Regex class in ...

An alternation is the simplified form of if-then-else available in the regular expression language. Let's start with a simple example. Suppose you wanted to match a1 or b2.

A long time ago, I wrote a utility for an employer that allowed testers to perform verification on data coming out of a hardware box using a regular expression language. It allowed users to ...

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 ...

The regular expression language processes text input by reading the string and comparing it against a matching sequence. Let's build the regular expression that answers your question; we'll start by ...

Take control of your data and filter out what doesn't help you to improve your search strategy. Learn how with this guide to regex for SEO.