If you were on Windows, you could try RegexBuddy. It supports regex dialects for: .NET, Boost (C++), Delphi, Groovy, Oracle Database, PowerShell, R, std::regex, VB6, wxWidgets, C#, MySQL, PHP, PostgreSQL, VBScript, Java, Perl, PCRE, JavaScript, Python, Ruby, Tcl ARE, POSIX BRE, POSIX ERE, GNU BRE, GNU ERE, XML Schema, and XPath. It will even generate code snippets for you based on the regex you create with the tool. It can also convert between these dialects and lets you know if features in the target dialect are not available.

I am not associated with this company in any way, just a long time user.