R is the name of the programming language in the R project for statistical computing. It’s a bit different from the usual programming languages I work with. R primarily works on vectors, and so does its regular expression functionality. This means the new regular expression source code snippets for R in RegexBuddy 3.2.0 are a little different from those for the other languages RegexBuddy supports. But that’s a good thing. The regexp functionality in R works well with the rest of the language. The new article Regular Expressions with The R Language on regular-expressions.info has more details.

Though the regex features are tailored for R, the regex flavors are not. R supports three flavors, called basic, extended and perl in R’s documentation. I call these flavors GNU BRE, GNU ERE and PCRE. RegexBuddy supports all three, but the R source code snippets only use PCRE. PCRE is far more powerful than GNU BRE and GNU ERE. These old flavors based on the POSIX standard have the same functionality, but BRE uses a different syntax than ERE and PCRE.

Windows PowerShell is Microsoft’s shell scripting language, based on the .NET framework. I’ve added an article to regular-expressions.info explaining how to use regular expressions with Windows PowerShell. RegexBuddy 3.2.0 now supports PowerShell strings and PowerShell source code snippets.

Since PowerShell is built on top of the .NET framework, .NET’s excellent regular expression support is also available to PowerShell programmers. PowerShell has special -match and -replace operators. These allow you to do the most common pattern matching and replacement jobs with PowerShell’s typical CmdLet and operator syntax.

For other functionality, such as splitting a string or replacing with a MatchEvaluator, you need to instantiate System.Text.RegularExpressions.Regex. One constructor of the Regex class is available through the shortcut [regex]. This constructor takes one parameter with your regex as a string. The Regex object allows you to do anything with regular expressions in PowerShell as in any other .NET language.