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 ...

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

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.

Fast track your regular expressions with the help of possessive quantifiers, independent grouping, lookarounds, and the regex pattern-matching engine itself.

Regular expressions amplify the power of traditional search-and-replace commands by letting you search for patterns of text and then selectively modify what you’ve found.

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 ...

How to use the regular expression functions provided by the ‘re’ library to match, search, and replace text in your Python programs.

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 ...

How to Use Regular Expressions to Group Pages in Google Analytics. Custom segments are powerful tools used for a variety of reporting. Combined with regular expressions, segments can be customized ...