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 ...

Common examples of regular expressions determine for example if a given string is an email address or a phone number, or they can be used to verify if a password fulfills a certain complexity.

Regular expressions are like power tools: They may look scary, but are easy to use once you understand their basic building blocks.

Regular expressions — the things you feed to programs like grep — are a bit like riding a bike. It seems impossible until you learn to do it, and then it’s easy. Part of their bad reputation ...

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 ...

This article demonstrates some useful ways to use regular expressions with PPC, by adding new dimensions to our typical Account/Campaign/AdGroup hierarchy of data. Another use for regular ...

Even though regex has a checkered past, don't let this sway you from using it when you need to. When you need to leverage regex in PowerShell you'll be using the .NET regex engine. Each language has ...

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: ...

Name Regular Expression Search The reflector DBM will accept a key that specifies a regular expression to be applied to names it knows. Name regular expressions follow standard rules for UNIX basic ...