What is a Regular Expression? A regular expression (or regex for short) is a sequence of characters that forms a search pattern. These expressions are helpful when we want to validate input from a ...

The first half of this tutorial introduced you to regular expressions and the Regex API. You learned about the Pattern class, then worked through examples demonstrating regex constructs, from basic ...

All but the most casual Linux users no doubt have encountered regular expressions, if only in a cursory manner. Regular expressions are extremely powerful and flexible pattern-matching and -replacing ...

In this challenge, we use regular expressions (RegEx) to remove instances of words that are repeated more than once, but retain the first occurrence of any case-insensitive repeated word. For example, ...

The people who attended my presentations at RMOUG Training Days 2010 asked several good questions. One question that was asked in the Groovy presentation that I really wish I had included a slide on ...