Known Regex Engines

Engine	Description	Online Testing
	re module	(not available)	metadata
	Package regexp	(not available)	metadata source uptime
		(not available)	metadata
	java.util.regex.Pattern	Running	metadata source status uptime
	RegExp object	Beta	metadata source status uptime
	System.Text.RegularExpressions.Regex	Running	metadata source status uptime
	perlre	(not available)	metadata source uptime
	PCRE Functions	Beta	metadata source status uptime
	re module	Running	metadata source status uptime
	Regexp class	Beta	metadata source status uptime

Check out the API specs if you want to add support for another engine

See the different options supported by each engine.