RegexBuddy is a regular expression programming tool by Just Great Software Co. Ltd. for the Microsoft Windows operating system. It provides an interface for building, testing, and debugging regular expressions, in addition to a library of commonly used regular expressions, an interface for generating code to use regular expressions in the desired programming environment, a graphical grep tool for searching through files and directories, and an integrated forum for seeking and providing regular expression advice with other RegexBuddy users. RegexBuddy's regular expression engine allows the software to emulate the rules and limitations of numerous popular regular expression flavors. Supported regular expression flavors 15 regular expression flavors are supported as of RegexBuddy 4.1.1. JGsoft An engine developed by the company that produces RegexBuddy. The JGsoft flavor is designed as a fusion flavor, and hence supports most syntax from other popular flavors. .NET The System.Text.RegularExpressions.Regex class in the .NET Framework, used by programming languages such as C# and Visual Basic .NET. Java The regular expression flavor of the package, available in the JDK 1.4 and later. Perl The regular expression flavor used in the Perl programming language version 5.8. PCRE Version 10.36 of Philip Hazel's open source Perl Compatible Regular Expressions library, used by PHP/preg and REALbasic. JavaScript The regular expression syntax defined in the third edition of ECMA-262, which standardizes JavaScript. Python The regular expression flavor supported by Python's built-in re module. Ruby The regular expression flavor built into the programming language. Tcl ARE The Tcl Advanced Regular Expressions flavor. POSIX BRE POSIX Basic Regular Expressions, defined in the IEEE POSIX regular expression standard. POSIX ERE POSIX Extended Regular Expressions, defined in the IEEE POSIX regular expression standard. GNU BRE The POSIX BRE flavor with GNU extensions. Used by the GNU implementations of traditional UNIX commands like grep, sed, and awk. GNU ERE The POSIX ERE flavor with GNU extensions. Used by the GNU implementations of traditional UNIX commands like grep, sed, and awk. XML Schema The regular expression flavor defined in the W3C XML Schema standard. XPath The regular expression flavor defined in the W3C XPath standard; used in XPath 2.0, XSLT 2.0 and XQuery 1.0. RegexBuddy allows generating code for a further extended number of environments, based on the above flavors. Supported modifiers Dot matches newline (aka single-line mode, commonly implemented as /s). Case insensitive (aka ignore case mode, commonly implemented as /i). ^$ match at line breaks (aka